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all geography including DSDP/ODP Sites and Legs
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K-40 (2)
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Pb-206/Pb-204 (1)
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Re-187/Os-188 (1)
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Rn-222 (3)
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stable isotopes
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B-11/B-10 (1)
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C-13/C-12 (17)
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D/H (10)
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He-4/He-3 (1)
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Hf-177/Hf-176 (1)
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Li-7/Li-6 (1)
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O-18/O-16 (12)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-206 (1)
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Re-187/Os-188 (1)
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S-34/S-32 (10)
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Sr-87/Sr-86 (4)
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-
-
metals
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actinides
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thorium
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uranium
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U-238 (2)
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U-238/Pb-204 (1)
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-
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alkali metals
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lithium
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Li-7/Li-6 (1)
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potassium
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K-40 (2)
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sodium (1)
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alkaline earth metals
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beryllium
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Be-10 (2)
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calcium (3)
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strontium
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Sr-87/Sr-86 (4)
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-
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aluminum (1)
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arsenic (1)
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chromium (1)
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copper (2)
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gold (1)
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hafnium
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Hf-177/Hf-176 (1)
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iron
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Fe-56/Fe-54 (1)
-
-
lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-206 (1)
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U-238/Pb-204 (1)
-
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mercury (4)
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molybdenum (2)
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nickel (1)
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platinum group
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osmium
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Re-187/Os-188 (1)
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-
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polonium (1)
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rare earths (5)
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rhenium
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Re-187/Os-188 (1)
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zinc (1)
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-
nitrogen (3)
-
noble gases
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argon
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Ar-40/Ar-39 (1)
-
-
helium
-
He-3 (1)
-
He-4/He-3 (1)
-
-
radon
-
Rn-222 (3)
-
-
-
oxygen
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O-18/O-16 (12)
-
-
silicon (2)
-
sulfur
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S-34/S-32 (10)
-
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trace metals (1)
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fossils
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burrows (2)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia (1)
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Reptilia
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Diapsida
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Archosauria
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dinosaurs (1)
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-
-
-
-
-
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ichnofossils
-
Planolites (1)
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Thalassinoides (1)
-
-
Invertebrata
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Cnidaria
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Anthozoa (1)
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Protista
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Foraminifera
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Rotaliina
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Rotaliacea
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Nummulitidae
-
Nummulites (1)
-
-
-
-
-
Radiolaria (1)
-
-
-
microfossils
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Charophyta (1)
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Conodonta (1)
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-
palynomorphs
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miospores
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pollen (1)
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-
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Plantae
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algae
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Chlorophyta
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Charophyta (1)
-
-
Coccolithophoraceae (2)
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diatoms (1)
-
-
-
tracks (1)
-
-
geochronology methods
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(U-Th)/He (1)
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Ar/Ar (10)
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exposure age (2)
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fission-track dating (2)
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infrared stimulated luminescence (1)
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K/Ar (1)
-
optical dating (1)
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optically stimulated luminescence (7)
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paleomagnetism (44)
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Pb/Pb (1)
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Re/Os (1)
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thermochronology (3)
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thermoluminescence (3)
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tree rings (1)
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U/Pb (7)
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U/Th/Pb (2)
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uranium disequilibrium (1)
-
-
geologic age
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Cenozoic
-
Quaternary
-
Holocene
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upper Holocene (9)
-
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Pleistocene
-
Bishop Tuff (4)
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Champlain Sea (1)
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Lake Missoula (1)
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lower Pleistocene (2)
-
middle Pleistocene (4)
-
upper Pleistocene
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Weichselian
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upper Weichselian
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Younger Dryas (1)
-
-
-
-
-
upper Quaternary (3)
-
-
Tertiary
-
Climax Porphyry (1)
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lower Tertiary (1)
-
middle Tertiary (1)
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Neogene
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Miocene
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Columbia River Basalt Group (2)
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middle Miocene (1)
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Paintbrush Tuff (3)
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Tiva Canyon Member (1)
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Topopah Spring Member (1)
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upper Miocene
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Messinian (1)
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Tortonian (1)
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-
-
Pliocene
-
lower Pliocene (1)
-
-
-
Paleogene
-
Eocene
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lower Eocene
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Ypresian (1)
-
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middle Eocene
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Lutetian (2)
-
-
upper Eocene
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Priabonian (1)
-
-
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Ilerdian (1)
-
Oligocene
-
Hemlock Conglomerate (1)
-
upper Oligocene (1)
-
-
Paleocene
-
lower Paleocene
-
Danian (2)
-
K-T boundary (1)
-
-
-
Tyonek Formation (1)
-
-
-
upper Cenozoic (3)
-
-
Laurentide ice sheet (1)
-
Mesozoic
-
Cretaceous
-
Comanchean
-
Buda Limestone (2)
-
Pearsall Formation (1)
-
-
Lower Cretaceous
-
Albian
-
upper Albian (1)
-
-
Aptian (2)
-
Barremian (1)
-
Mowry Shale (1)
-
Pearsall Formation (1)
-
-
Mancos Shale (2)
-
Middle Cretaceous (3)
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Upper Cretaceous
-
Buda Limestone (2)
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Campanian
-
lower Campanian (1)
-
-
Cenomanian
-
upper Cenomanian (1)
-
-
Cody Shale (1)
-
Ferron Sandstone Member (1)
-
Frontier Formation (1)
-
Gulfian
-
Austin Chalk (3)
-
Eagle Ford Formation (4)
-
-
Horseshoe Canyon Formation (1)
-
Kirtland Shale (1)
-
K-T boundary (1)
-
Maestrichtian (1)
-
Mesaverde Group (1)
-
Navesink Formation (1)
-
Niobrara Formation (1)
-
Shannon Sandstone Member (1)
-
Turonian (3)
-
Wall Creek Member (1)
-
-
-
Great Valley Sequence (1)
-
Jurassic
-
Lower Jurassic
-
Pliensbachian (1)
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Sinemurian (1)
-
Toarcian (1)
-
-
Middle Jurassic
-
Bajocian
-
Brent Group (1)
-
Etive Formation (1)
-
-
Callovian (1)
-
Summerville Formation (1)
-
-
Oxford Clay (1)
-
Upper Jurassic
-
Brushy Basin Member (1)
-
Kimmeridge Clay (1)
-
Morrison Formation (1)
-
Salt Wash Sandstone Member (1)
-
-
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
Middle Triassic (1)
-
Montney Formation (1)
-
Sherwood Sandstone (1)
-
Upper Triassic
-
Baldonnel Formation (1)
-
Pardonet Formation (1)
-
-
-
upper Mesozoic (1)
-
-
Paleozoic
-
Berea Sandstone (1)
-
Cambrian
-
Lower Cambrian (1)
-
-
Carboniferous
-
Mississippian
-
Barnett Shale (2)
-
-
Namurian (1)
-
Pennsylvanian
-
Joggins Formation (2)
-
-
Silesian (1)
-
Upper Carboniferous
-
Westphalian (1)
-
-
-
Devonian
-
Lower Devonian
-
Oriskany Sandstone (1)
-
York River Formation (1)
-
-
Old Red Sandstone (1)
-
Upper Devonian
-
Frasnian (1)
-
Grosmont Formation (1)
-
-
-
Knox Group (1)
-
lower Paleozoic
-
Chopawamsic Formation (1)
-
Elberton Granite (1)
-
-
Ordovician
-
Middle Ordovician
-
Winnipeg Formation (1)
-
-
Upper Ordovician (1)
-
-
Permian
-
Ecca Group (1)
-
Irati Formation (1)
-
Lower Permian
-
Wolfcampian (1)
-
-
Rio Bonito Formation (1)
-
Upper Permian
-
Permian-Triassic boundary (1)
-
-
-
Silurian
-
Upper Silurian (1)
-
-
Tensleep Sandstone (2)
-
upper Paleozoic
-
Dwyka Formation (1)
-
-
-
Precambrian
-
Archean (6)
-
Laramie anorthosite complex (1)
-
Uinta Mountain Group (1)
-
upper Precambrian
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Mahakoshal Group (1)
-
Proterozoic
-
Mesoproterozoic
-
Wumishan Formation (1)
-
-
Neoproterozoic
-
Ediacaran (2)
-
Torridonian (1)
-
-
Paleoproterozoic
-
Svecofennian (1)
-
-
Sinian
-
Wumishan Formation (1)
-
-
-
-
-
Saxothuringian (1)
-
-
igneous rocks
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extrusive rocks (1)
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igneous rocks
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carbonatites (2)
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granophyre (2)
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hypabyssal rocks (2)
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kimberlite (4)
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plutonic rocks
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anorthosite (2)
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diabase (3)
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diorites
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quartz diorites (1)
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gabbros
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troctolite (1)
-
-
granites
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monzogranite (1)
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muscovite granite (1)
-
-
granodiorites (2)
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lamproite (1)
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lamprophyres (1)
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pegmatite (1)
-
syenites
-
nepheline syenite
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agpaite (1)
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kakortokite (1)
-
lujavrite (1)
-
-
-
ultramafics
-
peridotites
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harzburgite (1)
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lherzolite (1)
-
-
pyroxenite (1)
-
-
-
volcanic rocks
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adakites (1)
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andesites (3)
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basalts
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alkali basalts (1)
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flood basalts (4)
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trap rocks (1)
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dacites (2)
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komatiite (1)
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phonolites (2)
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pyroclastics
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ignimbrite (2)
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pumice (1)
-
tuff (4)
-
-
rhyolites (2)
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trachyandesites (1)
-
-
-
ophiolite (1)
-
-
metamorphic rocks
-
metamorphic rocks
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cataclasites (1)
-
gneisses
-
banded gneiss (1)
-
biotite gneiss (1)
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orthogneiss (1)
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paragneiss (1)
-
-
metaigneous rocks
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metadiabase (1)
-
serpentinite (2)
-
-
metasedimentary rocks
-
paragneiss (1)
-
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metasomatic rocks
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fenite (1)
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serpentinite (2)
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skarn (2)
-
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migmatites (1)
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mylonites
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pseudotachylite (1)
-
ultramylonite (1)
-
-
quartzites (1)
-
schists
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greenschist (1)
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-
-
ophiolite (1)
-
-
meteorites
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meteorites (2)
-
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minerals
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carbonates
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calcite (5)
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dolomite (2)
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siderite (1)
-
-
halides
-
chlorides
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sylvite (1)
-
-
-
minerals (2)
-
oxides
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baddeleyite (1)
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hematite (1)
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iron oxides (3)
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magnetite (2)
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rutile (1)
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titanium oxides (2)
-
titanomagnetite (2)
-
-
phosphates
-
apatite (2)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
arfvedsonite (1)
-
hornblende (2)
-
-
-
pyroxene group
-
clinopyroxene
-
aegirine (1)
-
-
orthopyroxene (2)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
adularia (1)
-
K-feldspar (3)
-
-
plagioclase
-
albite (1)
-
-
-
silica minerals
-
quartz (3)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group
-
pyrope (1)
-
-
olivine group
-
olivine (1)
-
-
zircon group
-
zircon (6)
-
-
-
sorosilicates
-
epidote group
-
epidote (1)
-
-
-
-
sheet silicates
-
chlorite group
-
chlorite (2)
-
-
clay minerals
-
kaolinite (2)
-
smectite (2)
-
-
illite (3)
-
mica group
-
biotite (2)
-
muscovite (1)
-
-
-
-
sulfates
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alunite (3)
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anhydrite (2)
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barite (1)
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gypsum (1)
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polyhalite (1)
-
-
sulfides
-
chalcopyrite (1)
-
greigite (1)
-
nickel sulfides (1)
-
pyrite (2)
-
sphalerite (1)
-
-
-
Primary terms
-
absolute age (24)
-
Africa
-
Congo Craton (1)
-
East Africa
-
Ethiopia (1)
-
Ethiopian Rift (1)
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Malawi (2)
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Sudan (1)
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East African Rift (4)
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Namib Desert (1)
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North Africa
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Algeria (4)
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Atlas Mountains
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Moroccan Atlas Mountains
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High Atlas (1)
-
-
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Egypt
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Aswan Dam (1)
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Eastern Desert (3)
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Nile Delta (2)
-
-
Morocco
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Moroccan Atlas Mountains
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High Atlas (1)
-
-
Rabat Morocco (1)
-
Rif (1)
-
-
Tunisia (2)
-
-
Sahara (1)
-
Southern Africa
-
Botswana (2)
-
Kaapvaal Craton (1)
-
Karoo Basin (2)
-
Namibia (3)
-
South Africa
-
Bushveld Complex (2)
-
Cape fold belt (1)
-
Eastern Cape Province South Africa (1)
-
Free State South Africa
-
Vredefort Dome (1)
-
-
Gauteng South Africa
-
Johannesburg South Africa (2)
-
-
Merensky Reef (1)
-
Transvaal region (2)
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Witwatersrand (1)
-
-
Zimbabwe
-
Great Dyke (1)
-
-
-
West Africa
-
Cameroon
-
Mount Cameroon (1)
-
-
Ghana (1)
-
Guinea (1)
-
-
-
Antarctica
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East Antarctica (1)
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Queen Maud Land (1)
-
Ross Island (1)
-
Transantarctic Mountains (1)
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Victoria Land
-
McMurdo dry valleys
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Wright Valley (1)
-
-
-
-
Arctic Ocean
-
Alpha Cordillera (1)
-
Amerasia Basin (1)
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Barents Sea (1)
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Canada Basin (1)
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Eurasia Basin (1)
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Lomonosov Ridge (1)
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Makarov Basin (1)
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-
Arctic region
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Greenland
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Greenland ice sheet (1)
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Ilimaussaq (1)
-
-
Russian Arctic
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Franz Josef Land (2)
-
-
Svalbard
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Spitsbergen (1)
-
-
-
Asia
-
Altai Mountains
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Gorny Altai (1)
-
-
Altai Russian Federation
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Gorny Altai (1)
-
-
Arabian Peninsula
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Kuwait (1)
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Saudi Arabia
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Ghawar Field (1)
-
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Yemen (1)
-
-
Baikal region (2)
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Baikal rift zone (3)
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Buryat Russian Federation (2)
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Central Asia
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Kazakhstan (1)
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Pamirs (1)
-
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Far East
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Burma (1)
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China
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Altun Mountains (1)
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Altyn Tagh Fault (3)
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Anhui China (2)
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Gansu China (2)
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Guangdong China
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Zhujiang River (2)
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Hebei China
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Yanshan Range (1)
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Hubei China (3)
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Inner Mongolia China (4)
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Kunlun Fault (1)
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Kunlun Mountains (1)
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Liaoning China
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Haicheng China (1)
-
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North China Platform (4)
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Qaidam Basin (3)
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Qilian Mountains (1)
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Qinghai China (3)
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Qinling Mountains (1)
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Shandong China
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Jiyang Depression (1)
-
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Sichuan Basin (2)
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Sichuan China (9)
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South China Block (1)
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Taihang Mountains (1)
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Tancheng-Lujiang Fault (1)
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Xinjiang China
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Tarim Basin (1)
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Xizang China
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Yangtze Platform (1)
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Yunnan China
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Indonesia
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Java
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Sumatra
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Toba Lake (1)
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Japan
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Korea
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Gyeonggi Massif (1)
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Lesser Sunda Islands
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Timor (2)
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Mongolia
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Philippine Islands
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Himalayas
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India
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Andhra Pradesh India
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Bundelkhand (1)
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Ghats
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Gujarat India
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Kerala India (1)
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Maharashtra India
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Northeastern India
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Meghalaya India
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Shillong India (1)
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Pranhita-Godavari Valley (1)
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Rajasthan India
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Aravalli Range (1)
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Shillong Plateau (4)
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Son Valley (1)
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Southern Granulite Terrain (1)
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Tamil Nadu India
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Uttarakhand India
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Garhwal Himalayas (2)
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Indian Shield (1)
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Indo-Gangetic Plain (2)
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Nepal
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Kathmandu Valley (2)
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Pakistan
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Baluchistan Pakistan (1)
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Irkutsk Russian Federation
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Kamchatka Russian Federation
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Krasnoyarsk Russian Federation (1)
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Kyrgyzstan
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Issyk-kul Lake (1)
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Middle East
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Troodos Massif (2)
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Dead Sea (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
portable active seismic source methods
High‐Resolution Shear‐Wave Velocity Structure of the 2019 M s 6.0 Changning Earthquake Region and Its Implication for Induced Seismicity Available to Purchase
Evaluation of Ground‐Motion Models for USGS Seismic Hazard Models Using Near‐Source Instrumental Ground‐Motion Recordings of the Ridgecrest, California, Earthquake Sequence Available to Purchase
Efforts to monitor and characterize the recent increasing seismicity in central Oklahoma Available to Purchase
Ground-motion site effects from multimethod shear-wave velocity characterization at 16 seismograph stations deployed for aftershocks of the August 2011 Mineral, Virginia, earthquake Available to Purchase
We characterize shear-wave velocity versus depth (Vs profile) at 16 portable seismograph sites through the epicentral region of the 2011 M w 5.8 Mineral (Virginia, USA) earthquake to investigate ground-motion site effects in the area. We used a multimethod acquisition and analysis approach, where active-source horizontal shear (SH) wave reflection and refraction as well as active-source multichannel analysis of surface waves (MASW) and passive-source refraction microtremor (ReMi) Rayleigh wave dispersion were interpreted separately. The time-averaged shear-wave velocity to a depth of 30 m (Vs30), interpreted bedrock depth, and site resonant frequency were estimated from the best-fit Vs profile of each method at each location for analysis. Using the median Vs30 value (270–715 m/s) as representative of a given site, we estimate that all 16 sites are National Earthquake Hazards Reduction Program (NEHRP) site class C or D. Based on a comparison of simplified mapped surface geology to median Vs30 at our sites, we do not see clear evidence for using surface geologic units as a proxy for Vs30 in the epicentral region, although this may primarily be because the units are similar in age (Paleozoic) and may have similar bulk seismic properties. We compare resonant frequencies calculated from ambient noise horizontal:vertical spectral ratios (HVSR) at available sites to predicted site frequencies (generally between 1.9 and 7.6 Hz) derived from the median bedrock depth and average Vs to bedrock. Robust linear regression of HVSR to both site frequency and Vs30 demonstrate moderate correlation to each, and thus both appear to be generally representative of site response in this region. Based on Kendall tau rank correlation testing, we find that Vs30 and the site frequency calculated from average Vs to median interpreted bedrock depth can both be considered reliable predictors of weak-motion site effects in the epicentral region.