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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Colorado River basin (1)
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metals
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Mammalia
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Reptilia
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Invertebrata
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Quaternary
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Tertiary
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Mesozoic
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Cretaceous
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Paleozoic
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Carboniferous
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Lower Pennsylvanian
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Middle Pennsylvanian
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Permian
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Lower Permian
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igneous rocks
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Primary terms
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carbon
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Cenozoic
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Quaternary
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Holocene (1)
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Pleistocene
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Bandelier Tuff (6)
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lower Pleistocene (1)
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upper Pleistocene (1)
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Sierra Ladrones Formation (1)
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Tertiary
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Neogene
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Miocene
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lower Miocene
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Hemingfordian (1)
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upper Miocene (3)
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Zia Formation (3)
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Pliocene (3)
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Tesuque Formation (2)
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Paleogene
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Eocene (2)
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Oligocene
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upper Oligocene (1)
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Paleocene
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lower Paleocene
-
Danian (1)
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Torrejonian (2)
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Montian (1)
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Nacimiento Formation (5)
-
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Wilcox Group (1)
-
-
-
upper Cenozoic (1)
-
-
Chordata
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Vertebrata
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Tetrapoda
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Amphibia
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Labyrinthodontia
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Temnospondyli (1)
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-
-
Aves
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Neornithes (1)
-
-
Mammalia
-
Theria
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Eutheria
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Artiodactyla
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Ruminantia
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Tylopoda
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Camelidae (1)
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-
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Taeniodonta (1)
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Reptilia
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Anapsida
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Testudines
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Cryptodira (1)
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Diapsida
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Archosauria
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Crocodilia (1)
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dinosaurs (2)
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Synapsida
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clay mineralogy (1)
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dacites (1)
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obsidian (1)
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volcanic glass (2)
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pyroclastics
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ash-flow tuff (2)
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ignimbrite (1)
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pumice (3)
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inclusions
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Invertebrata
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Mollusca
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Cephalopoda
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-
-
isotopes
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radioactive isotopes
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stable isotopes
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lava (4)
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maps (1)
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Mesozoic
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Cretaceous
-
Dakota Formation (1)
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Lower Cretaceous
-
Burro Canyon Formation (1)
-
-
Mancos Shale (3)
-
Middle Cretaceous (1)
-
Upper Cretaceous
-
Fruitland Formation (4)
-
Kirtland Shale (3)
-
Lewis Shale (1)
-
Mesaverde Group (1)
-
Ojo Alamo Sandstone (4)
-
Pictured Cliffs Sandstone (1)
-
Point Lookout Sandstone (1)
-
-
-
Jurassic
-
Middle Jurassic
-
Todilto Formation (1)
-
-
Upper Jurassic
-
Entrada Sandstone (2)
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Morrison Formation (1)
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-
-
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metal ores
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gold ores (1)
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molybdenum ores (2)
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silver ores (1)
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uranium ores (1)
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metals
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alkali metals
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rubidium
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Rb-87/Sr-86 (1)
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alkaline earth metals
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magnesium (1)
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strontium
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Rb-87/Sr-86 (1)
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Sr-87/Sr-86 (3)
-
-
-
hafnium
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Hf-177/Hf-176 (1)
-
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iron
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ferric iron (1)
-
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
-
-
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metamorphic rocks
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metasomatic rocks (1)
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metasomatism (3)
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minerals (1)
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North America
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Basin and Range Province (1)
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North American Cordillera (1)
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Rio Grande Rift (13)
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Rocky Mountains
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U. S. Rocky Mountains (1)
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Western Interior (1)
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oil and gas fields (2)
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orogeny (4)
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oxygen
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paleoecology (1)
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paleogeography (9)
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paleontology (4)
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Paleozoic
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Carboniferous
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Lower Pennsylvanian
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Morrowan (2)
-
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Middle Pennsylvanian
-
Atokan
-
Atoka Formation (1)
-
-
-
-
-
Permian
-
Cutler Formation (1)
-
Lower Permian
-
Abo Formation (1)
-
Wichita Group (1)
-
-
-
-
palynomorphs
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megaspores (1)
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miospores (2)
-
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petroleum
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natural gas (1)
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petrology (6)
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Phanerozoic (2)
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phase equilibria (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Paleoproterozoic (1)
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sea-level changes (2)
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sedimentary petrology (3)
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clastic rocks
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sedimentary structures
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secondary structures
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concretions (2)
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sedimentation (13)
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Arkansas (1)
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California
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Inyo County California
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Mono County California
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Inyo Domes (1)
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Obsidian Dome (1)
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Colorado
-
Archuleta County Colorado (3)
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La Plata County Colorado (4)
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Montezuma County Colorado (1)
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Montrose County Colorado (1)
-
-
Colorado Plateau (8)
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New Mexico
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Bernalillo County New Mexico
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Albuquerque New Mexico (2)
-
-
Cibola County New Mexico (1)
-
Grants mineral belt (1)
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Jemez Lineament (2)
-
Jemez Mountains (16)
-
Los Alamos County New Mexico
-
Los Alamos National Laboratory (4)
-
-
McKinley County New Mexico (9)
-
Pajarito Plateau (1)
-
Rio Arriba County New Mexico (19)
-
San Juan County New Mexico (11)
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San Miguel County New Mexico (2)
-
Sandia Mountains (1)
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Sandoval County New Mexico
-
Fenton Hill (3)
-
-
Santa Fe County New Mexico (15)
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Socorro County New Mexico (1)
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Taos County New Mexico (6)
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Torrance County New Mexico (1)
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Valencia County New Mexico (3)
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Valles Caldera (9)
-
-
Oklahoma
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Cherokee County Oklahoma (1)
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Wagoner County Oklahoma (1)
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Texas
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Archer County Texas (1)
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Baylor County Texas (1)
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Wichita County Texas (1)
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U. S. Rocky Mountains (1)
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San Juan County Utah (1)
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Yavapai Province (1)
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volcanology (7)
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rock formations
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Santa Fe Group (3)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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travertine (1)
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clastic rocks
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mudstone (2)
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sandstone (9)
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shale (1)
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siltstone (1)
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volcaniclastics (5)
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sedimentary structures
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sedimentary structures
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sand bodies (2)
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secondary structures
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concretions (2)
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sediments
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sand (3)
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soils
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paleosols (2)
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soils (3)
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Sandoval County New Mexico
ABSTRACT Paleocene Lower Wilcox Group sedimentation rates are three times the Cenozoic average for the Gulf of Mexico region and are attributed to Laramide tectonism within the Laramide–Rocky Mountains region. These increased rates likely represent the erosion of easily weathered Phanerozoic strata that blanketed the Laramide-age basement-cored uplifts. Geologic observations and U-Pb geochronology are not sufficient to fully address this hypothesis alone, so we conducted 439 Lu-Hf isotopic analyses on detrital zircons from eight samples from the San Juan Basin and five samples from the Gulf of Mexico Basin. Focusing on the zircons younger than 300 Ma allowed us to make direct comparisons to the eight principal components that comprise the North American Cordilleran magmatic arc: (1) Coast Mountains batholith; (2) North Cascades Range; (3) Idaho batholith; (4) Sierra Nevada batholith; (5) Laramide porphyry copper province; (6) Transverse Ranges; (7) Peninsular Ranges; and (8) Sierra Madre Occidental. The εHf ( t ) results range from +8.9 to –27.0 for the San Juan Basin samples and from +13.0 to –26.6 for the Gulf of Mexico samples. Using the San Juan Basin samples as a proxy for the eroded Mesozoic cover that was shed from the Laramide uplifts, we show that much of the sediment entering the Gulf of Mexico through the Houston and Mississippi embayments during the late Paleocene was derived from reworked cover from the greater Laramide–Rocky Mountains region. However, the Gulf of Mexico samples also include a distinct juvenile suite (εHf [ t ] ranging from +13 to +5) of zircons ranging in age from ca. 220 to 55 Ma that we traced to the Coast Mountains batholith in British Columbia, Canada. This transcontinental connection indicates an extension to the headwaters of the previously defined paleo-Mississippi drainage basin from ca. 58 to 56 Ma. Therefore, we propose a through-going fluvial system (referred to here as the “Coast Mountains River”) that was routed from the Coast Mountains batholith to the Gulf of Mexico. This expands the previously defined paleo-Mississippi drainage basin area by an estimated 280,000 km 2 . Our comprehensive Hf isotopic compilation of the North American Cordilleran magmatic arc also provides a benchmark εHf ( t ) versus U-Pb age plot, which can be used to determine provenance of detrital zircons (85–50 Ma) at the scale of specific region(s) within the Cordillera based on their εHf ( t ) values.