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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Tanzania (1)
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Zambia (1)
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North Africa
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Egypt
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Middle East
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Atlantic Ocean
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Louisiana (3)
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Maine (1)
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Maryland (9)
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Massachusetts
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Barnstable County Massachusetts
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Cape Cod
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Essex County Massachusetts (1)
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Suffolk County Massachusetts
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Boston Massachusetts (2)
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Michigan (1)
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Mississippi (45)
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Mississippi Embayment (2)
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Mississippi Valley (2)
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Missouri
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New Madrid County Missouri
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New Madrid Missouri (1)
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Montana
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Lincoln County Montana
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Monticello Reservoir (4)
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Nevada (3)
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New England (2)
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New Hampshire
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Hillsborough County New Hampshire
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New Jersey (3)
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New Madrid region (10)
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New Mexico (1)
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New York
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New York City New York (3)
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North Carolina
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Anson County North Carolina (1)
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Beaufort County North Carolina (1)
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Bertie County North Carolina (1)
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Bladen County North Carolina (3)
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Cape Fear Arch (2)
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Carteret County North Carolina (1)
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Gaston County North Carolina (2)
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Harnett County North Carolina (1)
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Jackson County North Carolina (1)
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Jones County North Carolina (1)
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Montgomery County North Carolina (1)
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Onslow Bay (1)
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Robeson County North Carolina (4)
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Stanly County North Carolina (1)
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Transylvania County North Carolina (1)
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Wayne County North Carolina (1)
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Wilkes County North Carolina (1)
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Yadkin County North Carolina (1)
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Okefenokee Swamp (4)
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Pennsylvania (3)
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Allendale County South Carolina (2)
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Barnwell County South Carolina (9)
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Beaufort County South Carolina (5)
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Berkeley County South Carolina (16)
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Calhoun County South Carolina (2)
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Charleston County South Carolina
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Ashley River Fault (1)
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Charleston South Carolina (56)
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Cherokee County South Carolina (2)
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Chesterfield County South Carolina (5)
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Clarendon County South Carolina (3)
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Colleton County South Carolina (1)
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Darlington County South Carolina (2)
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Dorchester County South Carolina (15)
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Edgefield County South Carolina (3)
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Fairfield County South Carolina (12)
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Florence County South Carolina (4)
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Georgetown County South Carolina (4)
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Horry County South Carolina (14)
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Jasper County South Carolina (3)
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Kershaw County South Carolina (8)
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Lake Jocassee (2)
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Lancaster County South Carolina (14)
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Lee County South Carolina (1)
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Lexington County South Carolina (3)
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Marion County South Carolina (5)
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Oconee County South Carolina (9)
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Orangeburg County South Carolina (1)
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Pickens County South Carolina (4)
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Richland County South Carolina
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Saluda County South Carolina (2)
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Santee River (5)
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Southern U.S. (6)
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Suwannee River (2)
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Texas
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Galveston Island (1)
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Utah
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magnesium
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nitrogen (1)
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oxygen
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Tetrapoda
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Mammalia
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Carnivora
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Cetacea
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Perissodactyla
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Tertiary
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Paleogene
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Huber Formation (3)
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Oligocene
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upper Oligocene
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Paleocene
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upper Paleocene
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upper Cenozoic
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Mesozoic
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Primary terms
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catalogs (2)
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Cenozoic
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Quaternary
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Pleistocene
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lower Pleistocene
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upper Pleistocene (2)
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upper Quaternary (1)
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Tertiary
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lower Tertiary (2)
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Neogene
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lower Miocene
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Chipola Formation (1)
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middle Miocene (4)
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Pungo River Formation (1)
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upper Miocene
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Duplin Formation (3)
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-
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Pliocene
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middle Pliocene (2)
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Yorktown Formation (2)
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Paleogene
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Black Mingo Group (3)
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Eocene
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Castle Hayne Limestone (3)
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middle Eocene
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upper Eocene
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Dry Branch Formation (3)
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Twiggs Clay (4)
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-
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Huber Formation (3)
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Ocala Group (2)
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Oligocene
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lower Oligocene
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Rupelian (2)
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Suwannee Limestone (1)
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upper Oligocene
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Chattian (2)
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Paleocene
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Clayton Formation (1)
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lower Paleocene
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Danian (1)
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K-T boundary (4)
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Midway Group (1)
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upper Paleocene
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upper Cenozoic
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Porifera (2)
-
Protista
-
Foraminifera
-
Textulariina
-
Lituolacea
-
Trochammina (1)
-
-
-
-
-
Vermes
-
Annelida (1)
-
-
-
isostasy (3)
-
isotopes
-
radioactive isotopes
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Ar-40/Ar-39 (1)
-
Be-10 (1)
-
Be-10/Be-9 (1)
-
C-14 (5)
-
Cs-137 (1)
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I-129 (1)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Sm-147/Nd-144 (1)
-
tritium (9)
-
U-238 (1)
-
-
stable isotopes
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Ar-40/Ar-39 (1)
-
Be-10/Be-9 (1)
-
C-13/C-12 (2)
-
D/H (2)
-
deuterium (1)
-
Hf-177/Hf-176 (1)
-
Nd-144/Nd-143 (2)
-
O-18/O-16 (6)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
S-34/S-32 (2)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (4)
-
-
-
kaolin deposits (13)
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land subsidence (1)
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land use (3)
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lava (1)
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lineation (1)
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magmas (11)
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mantle (5)
-
maps (14)
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marine geology (6)
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marine installations (1)
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Mesozoic
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Cretaceous
-
Lower Cretaceous
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Albian (2)
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Aptian (1)
-
-
Mancos Shale (1)
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Upper Cretaceous
-
Black Creek Formation (1)
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Blufftown Formation (2)
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Campanian (2)
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Demopolis Chalk (1)
-
Eutaw Formation (2)
-
Ferron Sandstone Member (1)
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Gulfian
-
Prairie Bluff Chalk (1)
-
-
K-T boundary (4)
-
Maestrichtian
-
upper Maestrichtian (1)
-
-
Middendorf Formation (2)
-
Peedee Formation (3)
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Ripley Formation (1)
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Senonian (2)
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Turonian (1)
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Tuscaloosa Formation (4)
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-
-
Jurassic
-
Lower Jurassic
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Toarcian (1)
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upper Liassic (1)
-
-
-
lower Mesozoic (3)
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Newark Supergroup (1)
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Triassic
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Middle Triassic
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Ladinian (1)
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-
Upper Triassic
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Carnian (1)
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Norian (1)
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-
-
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metal ores
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base metals (3)
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gold ores (20)
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manganese ores (2)
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molybdenum ores (2)
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polymetallic ores (1)
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silver ores (2)
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titanium ores (1)
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-
metals
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actinides
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plutonium (3)
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thorium (1)
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uranium
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U-238 (1)
-
-
-
alkali metals
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cesium
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Cs-137 (1)
-
-
potassium (1)
-
-
alkaline earth metals
-
beryllium
-
Be-10 (1)
-
Be-10/Be-9 (1)
-
-
calcium
-
Mg/Ca (1)
-
-
magnesium
-
Mg/Ca (1)
-
-
strontium
-
Sr-87/Sr-86 (4)
-
-
-
aluminum (2)
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chromium (3)
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cobalt (1)
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copper (4)
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gold (2)
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
iron
-
ferric iron (1)
-
-
lead
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
manganese (5)
-
mercury (1)
-
precious metals (2)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (2)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
-
silver (1)
-
tin (1)
-
titanium (1)
-
zinc (2)
-
zirconium (1)
-
-
metamorphic rocks
-
amphibolites (3)
-
eclogite (1)
-
gneisses
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augen gneiss (1)
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granite gneiss (2)
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orthogneiss (1)
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paragneiss (2)
-
-
hornfels (2)
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marbles (3)
-
metaigneous rocks
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metadacite (1)
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metagabbro (3)
-
metagranite (1)
-
serpentinite (1)
-
-
metaplutonic rocks (2)
-
metasedimentary rocks
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metapelite (2)
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paragneiss (2)
-
-
metasomatic rocks
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rodingite (1)
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serpentinite (1)
-
-
metavolcanic rocks (16)
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mylonites
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pseudotachylite (1)
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phyllites (1)
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phyllonites (2)
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quartzites (4)
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schists
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chlorite schist (1)
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metamorphism (36)
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metasomatism (15)
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meteorites (1)
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Mexico (1)
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mineral deposits, genesis (29)
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mineral exploration (8)
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mineral resources (1)
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mineralogy (20)
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minerals (27)
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Mohorovicic discontinuity (2)
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museums (2)
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nitrogen (1)
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noble gases
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argon
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Ar-40/Ar-39 (1)
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nodules (1)
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nonmetal deposits (1)
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North America
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Appalachian Basin (1)
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Appalachians
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Blue Ridge Mountains (5)
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Blue Ridge Province (10)
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Carolina slate belt (26)
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Central Appalachians (5)
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Cumberland Plateau (3)
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Great Appalachian Valley (1)
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Northern Appalachians (1)
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Piedmont
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Inner Piedmont (2)
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-
Southern Appalachians (69)
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Valley and Ridge Province (2)
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-
Canadian Shield
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Grenville Province
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Central Metasedimentary Belt (1)
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-
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Eastern Overthrust Belt (1)
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Great Plains (1)
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Gulf Coastal Plain (31)
-
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nuclear facilities (7)
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ocean basins (1)
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ocean circulation (2)
-
Ocean Drilling Program
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Leg 171B
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ODP Site 1050 (1)
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ODP Site 1052 (1)
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-
-
ocean waves (4)
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Oceania
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Polynesia
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Hawaii (1)
-
-
-
oceanography (9)
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oil and gas fields (4)
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orogeny (21)
-
oxygen
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O-18/O-16 (6)
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-
paleobotany (5)
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paleoclimatology (7)
-
paleoecology (28)
-
paleogeography (20)
-
paleomagnetism (5)
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paleontology (38)
-
Paleozoic
-
Cambrian
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Acadian (2)
-
Conasauga Group (1)
-
Lower Cambrian (1)
-
Middle Cambrian (3)
-
Upper Cambrian (1)
-
-
Carboniferous
-
Lower Carboniferous
-
Dinantian (1)
-
-
Middle Carboniferous (1)
-
Mississippian
-
Lower Mississippian
-
Fort Payne Formation (2)
-
-
Upper Mississippian
-
Bangor Limestone (1)
-
Pennington Formation (2)
-
-
-
Pennsylvanian
-
Lower Pennsylvanian
-
Gizzard Group (1)
-
Pocahontas Formation (1)
-
-
-
Upper Carboniferous (2)
-
-
Devonian
-
Upper Devonian (1)
-
-
lower Paleozoic
-
Elberton Granite (1)
-
Henderson Gneiss (1)
-
-
middle Paleozoic
-
Hillabee Chlorite Schist (1)
-
-
Ordovician
-
Middle Ordovician
-
Bromide Formation (1)
-
Chazyan (1)
-
Deicke Bentonite Bed (1)
-
Millbrig Bentonite Bed (1)
-
Normanskill Formation (1)
-
Saint Peter Sandstone (2)
-
-
Upper Ordovician
-
Trentonian (1)
-
-
Viola Limestone (1)
-
-
Permian (14)
-
Petersburg Granite (1)
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Silurian
-
Lower Silurian
-
Llandovery (1)
-
-
-
Talladega Group (1)
-
upper Paleozoic (7)
-
-
palynomorphs
-
Dinoflagellata
-
Deflandrea (1)
-
-
miospores
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Momipites (1)
-
pollen (8)
-
-
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paragenesis (7)
-
petroleum
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natural gas (24)
-
-
petrology (39)
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Phanerozoic (1)
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phase equilibria (10)
-
placers (4)
-
Plantae
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algae
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Chlorophyta
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Chlorophyceae
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Dasycladaceae (1)
-
-
-
diatoms (4)
-
nannofossils (5)
-
Rhodophyta
-
Corallinaceae
-
Archaeolithothamnium (1)
-
-
-
-
Pteridophyta
-
Sphenopsida (1)
-
-
Spermatophyta
-
Angiospermae
-
Dicotyledoneae
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Carya (1)
-
Platycarya (1)
-
-
-
-
-
plate tectonics (35)
-
pollution (40)
-
Precambrian
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Archean
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Neoarchean (1)
-
-
upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
-
Neoproterozoic
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Ediacaran (1)
-
Walden Creek Group (1)
-
-
-
-
-
Pterobranchia (1)
-
reclamation (1)
-
reefs (1)
-
remote sensing (4)
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reservoirs (6)
-
roads (1)
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sea water (1)
-
sea-level changes (11)
-
sedimentary petrology (40)
-
sedimentary rocks
-
bauxite (2)
-
carbonate rocks
-
limestone (8)
-
-
chemically precipitated rocks
-
chert (1)
-
evaporites
-
salt (1)
-
-
iron formations (2)
-
phosphate rocks (1)
-
-
clastic rocks
-
argillite (2)
-
bentonite (1)
-
claystone (1)
-
conglomerate (1)
-
marl (1)
-
red beds (1)
-
sandstone (8)
-
shale (4)
-
-
coal (2)
-
-
sedimentary structures
-
bedding plane irregularities
-
antidunes (2)
-
dune structures (1)
-
ripple marks (3)
-
-
biogenic structures
-
bioturbation (2)
-
lebensspuren (2)
-
-
planar bedding structures
-
bedding (2)
-
cross-bedding (5)
-
cross-laminations (1)
-
cross-stratification (1)
-
laminations (3)
-
sand bodies (2)
-
-
primary structures (1)
-
secondary structures
-
armored mud balls (1)
-
-
soft sediment deformation
-
olistoliths (1)
-
-
-
sedimentation (42)
-
sediments
-
clastic sediments
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alluvium (1)
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clay (17)
-
flint clay (1)
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kaolin (9)
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mud (5)
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quartz sand (1)
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sand (36)
-
silt (2)
-
-
marine sediments (5)
-
peat (4)
-
-
seismology (53)
-
shorelines (13)
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soil mechanics (9)
-
soils
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Clay soils (1)
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Mollisols (1)
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Ultisols (5)
-
-
South America
-
Brazil (2)
-
-
springs (4)
-
stratigraphy (54)
-
structural analysis (13)
-
structural geology (49)
-
sulfur
-
S-34/S-32 (2)
-
-
symposia (1)
-
tectonics
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neotectonics (16)
-
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tectonophysics (11)
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thallophytes (10)
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underground installations (2)
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United States
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Alabama
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Alabama River (1)
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Mobile Bay (1)
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Alaska (1)
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Arizona
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Apache County Arizona (1)
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Arkansas (9)
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Atlantic Coastal Plain
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Central Atlantic Coastal Plain (4)
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Southern Atlantic Coastal Plain (35)
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Black Warrior Basin (2)
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Blue Ridge Mountains (5)
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Brevard Zone (6)
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California
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Butte County California
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Oroville California (1)
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-
Los Angeles County California
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Los Angeles California (1)
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Mono County California (1)
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Northern California (1)
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San Francisco County California
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San Francisco California (1)
-
-
Santa Clara County California (1)
-
-
Carolina Bays (5)
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Carolina Terrane (10)
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Charlotte Belt (3)
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Chattahoochee River (3)
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Chesapeake Bay (1)
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Cincinnati Arch (1)
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Colorado (2)
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Connecticut (2)
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Culpeper Basin (1)
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Dan River basin (1)
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District of Columbia (1)
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Dunbarton Basin (8)
-
Eastern U.S.
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Southeastern U.S. (28)
-
-
Florida
-
Apalachicola River (1)
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Brevard County Florida
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Cape Canaveral (1)
-
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Columbia County Florida (1)
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Everglades (1)
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Leon County Florida (1)
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Palm Beach County Florida (1)
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Floridan Aquifer (4)
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Georgia
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Altamaha River (1)
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Bryan County Georgia (1)
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Bulloch County Georgia (2)
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Burke County Georgia (4)
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Chatham County Georgia (1)
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Columbia County Georgia (1)
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DeKalb County Georgia (1)
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Effingham County Georgia (1)
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Elbert County Georgia (1)
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Emanuel County Georgia (2)
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Franklin County Georgia (1)
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Fulton County Georgia
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Atlanta Georgia (1)
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Glynn County Georgia (2)
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Greene County Georgia (1)
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Gwinnett County Georgia (1)
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Habersham County Georgia (1)
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Hancock County Georgia (1)
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Jefferson County Georgia (4)
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Lincoln County Georgia (3)
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Madison County Georgia (1)
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McDuffie County Georgia (1)
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Oglethorpe County Georgia (1)
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Rabun County Georgia (2)
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Richmond County Georgia (4)
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Rockdale County Georgia (1)
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Screven County Georgia (1)
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Stephens County Georgia (1)
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Twiggs County Georgia (3)
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Warren County Georgia (2)
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Washington County Georgia (6)
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Wilkinson County Georgia (5)
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Great Smoky Fault (2)
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Kings Mountain Belt (4)
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Louisiana (3)
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Maryland (9)
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Massachusetts
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Barnstable County Massachusetts
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Cape Cod
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Monomoy Island (1)
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Essex County Massachusetts (1)
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Suffolk County Massachusetts
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Boston Massachusetts (2)
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Michigan (1)
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Midwest (5)
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Minnesota (1)
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Mississippi (45)
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Mississippi Embayment (2)
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Mississippi Valley (2)
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Missouri
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New Madrid County Missouri
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Montana
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Deer Lodge County Montana (1)
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Monticello Reservoir (4)
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Nevada (3)
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Hillsborough County New Hampshire
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New Jersey (3)
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New York
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New York City New York (3)
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North Carolina
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Anson County North Carolina (1)
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Bladen County North Carolina (3)
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Cape Fear Arch (2)
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Dare County North Carolina (1)
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Gaston County North Carolina (2)
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Halifax County North Carolina (1)
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Harnett County North Carolina (1)
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Jackson County North Carolina (1)
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Jones County North Carolina (1)
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Montgomery County North Carolina (1)
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Onslow Bay (1)
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Onslow County North Carolina (1)
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Robeson County North Carolina (4)
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Stanly County North Carolina (1)
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Surry County North Carolina (1)
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Transylvania County North Carolina (1)
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Union County North Carolina (1)
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Wayne County North Carolina (1)
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Wilkes County North Carolina (1)
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Yadkin County North Carolina (1)
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Okefenokee Swamp (4)
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Oklahoma
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Cleveland County Oklahoma (1)
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Meers Fault (2)
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Payne County Oklahoma (1)
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Ozark Mountains (1)
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Pennsylvania (3)
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Pine Mountain Window (4)
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Reelfoot Rift (1)
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Savannah River (7)
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South Carolina
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Aiken County South Carolina
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Aiken South Carolina (9)
-
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Allendale County South Carolina (2)
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Anderson County South Carolina (1)
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Barnwell County South Carolina (9)
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Beaufort County South Carolina (5)
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Berkeley County South Carolina (16)
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Calhoun County South Carolina (2)
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Charleston County South Carolina
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Ashley River Fault (1)
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Charleston South Carolina (56)
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Cherokee County South Carolina (2)
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Chester County South Carolina (1)
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Chesterfield County South Carolina (5)
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Clarendon County South Carolina (3)
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Colleton County South Carolina (1)
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Darlington County South Carolina (2)
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Dorchester County South Carolina (15)
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Edgefield County South Carolina (3)
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Fairfield County South Carolina (12)
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Florence County South Carolina (4)
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Georgetown County South Carolina (4)
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Horry County South Carolina (14)
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Jasper County South Carolina (3)
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Kershaw County South Carolina (8)
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Lake Jocassee (2)
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Lancaster County South Carolina (14)
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Lee County South Carolina (1)
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Lexington County South Carolina (3)
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Marion County South Carolina (5)
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McCormick County South Carolina (3)
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Oconee County South Carolina (9)
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Orangeburg County South Carolina (1)
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Pickens County South Carolina (4)
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Richland County South Carolina
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Columbia South Carolina (3)
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Saluda County South Carolina (2)
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Santee River (5)
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Savannah River Site (48)
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Snuggedy Swamp (1)
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Sumter County South Carolina (2)
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Union County South Carolina (2)
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Williamsburg County South Carolina (2)
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York County South Carolina (2)
-
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South Dakota (2)
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Southern U.S. (6)
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Suwannee River (2)
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Talladega Front (1)
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Tennessee
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Blount County Tennessee (2)
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Oak Ridge National Laboratory (1)
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Shelby County Tennessee
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Texas
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East Texas (1)
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Galveston County Texas
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Utah
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Salt Lake County Utah
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Salt Lake City Utah (1)
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Vermont (1)
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Virginia
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Dinwiddie County Virginia (1)
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Washington
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Hanford Site (1)
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West Virginia
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weathering (13)
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well-logging (5)
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X-ray analysis (1)
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rock formations
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Kirkwood Formation (1)
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Ocoee Supergroup (4)
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Red Mountain Formation (1)
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Severn Formation (1)
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Tallulah Falls Formation (2)
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Wilcox Formation (1)
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-
sedimentary rocks
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oolite (1)
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sedimentary rocks
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bauxite (2)
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carbonate rocks
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limestone (8)
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chemically precipitated rocks
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chert (1)
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evaporites
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salt (1)
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iron formations (2)
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phosphate rocks (1)
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clastic rocks
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bentonite (1)
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claystone (1)
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conglomerate (1)
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marl (1)
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red beds (1)
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shale (4)
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coal (2)
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siliciclastics (2)
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sedimentary structures
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borings (5)
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channels (11)
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sedimentary structures
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bedding plane irregularities
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antidunes (2)
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dune structures (1)
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ripple marks (3)
-
-
biogenic structures
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
The paleobiologic implications of modern nonmarine ecological gradients Open Access
The palynology of purple honey: kudzu dismissed, aluminum-sourwood reaction and other sources behind color plausible Available to Purchase
Static and Dynamic Strain in the 1886 Charleston, South Carolina, Earthquake Available to Purchase
On the Provenance of Field Reports of the 1886 Charleston, South Carolina, Earthquake: A Seismo‐Historical Whodunnit Available to Purchase
Structural inheritance in Carolinia, external to the excised Rheic Suture: Savannah River Site, South Carolina, USA. Available to Purchase
Abstract Phanerozoic reactivations of basement fault zones are documented in 5000 m of basement core recovered from beneath the updip Atlantic Coastal Plain underlying the US Department of Energy Savannah River Site (SRS) in South Carolina. These basement fault zones are adjacent to the excised Rheic Ocean suture. Meta-intrusive rocks from c. 620 and 625 Ma contain a mylonitic fabric and intrude foliated mafic metavolcanic rocks. At c. 305 Ma, granulite facies orthogneisses were thrust over amphibolite facies meta-igneous rocks in the transpressive Tinker Creek Nappe. The overturned limb of the nappe localizes the Triassic Dunbarton Basin Border Fault. The border fault acted as a conduit for fluids in the Mesozoic and Cenozoic. At c. 220 ± 5 Ma, a potassium and silica metasomatic event affected the SRS basement. A propylitic event flushed reducing fluids through rocks as young as the Santonian. The remains of a Triassic sub-basin were identified in the northwesten part of the site. A Cretaceous and younger vein paragenesis overprints the previous events. More than 30 pseudotachylytes are found in the SRS basement and are preferentially localized on metasomatized Alleghanian chloritic fractures. Pseudotachylyte post-dates mineralized fractures. The Pen Branch Fault offsets the basement–Cretaceous unconformity and is present in c. 242 m of core between PBF-7-419 m and PBF-7-660.8 m. The Pen Branch Fault cross-cuts mineralized fractures and must post-date strike-normal zeolites.
Earthquake Rupture Forecast Model Construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and Eastern U.S. Fault‐Based Source Model Available to Purchase
The 1886 Charleston, South Carolina, Earthquake: Intensities and Ground Motions Available to Purchase
The 1886 Charleston, South Carolina, Earthquake: Relic Railroad Offset Reveals Rupture Open Access
Preliminary Results from a Dense Short‐Period Seismic Deployment around the Source Zone of the 1886 M 7 South Carolina Earthquake Available to Purchase
Transfer of the Cretaceous fossil vertebrate collection from Columbus State University to the Smithsonian's National Museum of Natural History Available to Purchase
Stratigraphic architecture and fluvial interpretations of the Upper Cretaceous (Turonian?) Middendorf Formation, Chesterfield County, South Carolina, U.S.A. Available to Purchase
Rare-Earth Minerals in Kaolin Ore, Mine Tailings, and Sands – Central Georgia, Upper Coastal Plain Available to Purchase
‘EX PEDE HERCULEM’: SLOTHS, SLAVERY, AND SOUTHERN FOSSIL COLLECTION IN THE NINETEENTH CENTURY Available to Purchase
Review and revision of the Olivoidea (Neogastropoda) from the Paleocene and Eocene of the U.S. Gulf Coastal Plain Open Access
Transformation of eastern North America from compression to extension in the Permian–Triassic Available to Purchase
ABSTRACT The record of Permian–Triassic evolution in eastern North America indicates an important change in the tectonic regime from compression to extension as eastern Laurentia transitioned from the Alleghanian orogeny to continental rifting associated with the breakup of Pangea. The temporal pace (e.g., gradual vs. episodic, diachronous vs. synchronous), the accommodating structures, and the influential processes that characterized this transition provide critical insights into the late Paleozoic evolution of Laurentia and rifted continental margins in general. Connections between the formation of the South Georgia basin and regional cooling of the southernmost Appalachian crystalline rocks, along with the distribution of normal faults and discontinuities in metamorphic grade, indicate extensional collapse of the Alleghanian orogen along an extensive detachment system that was active from ca. 295 to 240 Ma. The 40 Ar/ 39 Ar cooling ages of biotites from low-angle normal shear zones cutting migmatitic gneisses of the southernmost Appalachians are interpreted to document extensional faulting ca. 280 Ma and to provide a snapshot of the prolonged orogenic collapse. The timing, orientation of structures, extent of reactivation, and character of late Alleghanian extension in the central and northern Appalachians provide an orogen-scale framework for this tectonic transition. This contribution focuses on correlations between the beginning of orogenic collapse and the initiation of continental rifting along with the tectonic processes that transformed eastern North America from a convergent to divergent plate boundary following the Alleghanian orogeny.