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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 (1)
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North America
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Primary terms
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Tertiary
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Neogene
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Hemphillian (3)
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Miocene
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Ash Hollow Formation (5)
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Barstovian (2)
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Clarendonian (3)
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upper Miocene (9)
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Valentine Formation (2)
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Ogallala Formation (43)
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lower Pliocene (1)
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Paleogene
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middle Eocene
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Oligocene
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upper Cenozoic (2)
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Chordata
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Ogallala Formation
Fluvial response to Late Pleistocene–Holocene climate change in the Colorado River drainage, central Texas, USA: COMMENT
Structural architecture of the Farnsworth oil unit: Implications for geologic storage of carbon dioxide
Investigating internal magnetic field gradients in aquifer sediments
The influence of long-wavelength tilting and climatic change on sediment accumulation
Abstract The Lagerstätte at Ashfall Fossil Beds—the result of supervolcanic eruption—preserves a mass-death assemblage of articulated skeletons of reptiles, birds, and mammals in a 3-m-thick pure volcanic ash near the base of the Cap Rock Member of the Ash Hollow Formation in Antelope County, Nebraska. The ash originated from the Bruneau-Jarbidge caldera in southwest Idaho, some 1600 km away, and it is geochemically matched with the Ibex Hollow tuff (11.93 Ma). Ashfall is a critical Clarendonian North American Land Mammal Age locality. More than 20 taxa—predominantly medium- and large-sized ungulates preserved in three dimensions—are buried in a late Miocene paleodepression (waterhole) filled with tephra reworked from the landscape by wind and water. Smaller taxa, such as birds, turtles, and moschids, died shortly after the pyroclastic airfall event and their remains are preserved in the basal ash. Remains from the medium-sized ungulates (equids and camelids) are separated from the underlying smaller skeletons by several centimeters of ash, indicating that these animals died at a slightly later time. In turn, more than 100 mostly intact skeletons of the barrel-bodied rhinoceros, Teleoceras major , overlie the remains of the medium-sized taxa. Pathologic bone on the limbs and skulls of the horses, camels, and rhinos suggests short-term survival and slow death several weeks or months after the pyroclastic airfall event. Exquisite preservation in an information-rich context allows aspects of the behavior, social structure, intraspecific variability, and pathology of extinct species to be reconstructed.
EXCEPTIONALLY WELL PRESERVED LATEST MIOCENE (HEMPHILLIAN) RODENT BURROWS FROM THE EASTERN GREAT PLAINS, UNITED STATES, AND A REVIEW OF THE BURROWS OF NORTH AMERICAN RODENTS
Abrupt landscape change post–6 Ma on the central Great Plains, USA
Geochemical evaluation of high sulfate levels in Ponca Creek, northeastern Nebraska
The Neogene transition from C 3 to C 4 grasslands in North America: stable carbon isotope ratios of fossil phytoliths
The Neogene transition from C 3 to C 4 grasslands in North America: assemblage analysis of fossil phytoliths
Interplay of oceanographic and paleoclimate events with tectonism during middle to late Miocene sedimentation across the southwestern USA
Post-Paleozoic alluvial gravel transport as evidence of continental tilting in the U.S. Cordillera
Sizes and Shapes of 10-Ma Distal Fall Pyroclasts in the Ogallala Group, Nebraska
Geomorphic and tectonic forcing of late Cenozoic warping of the Colorado piedmont
Postdepositional tilt of the Miocene-Pliocene Ogallala Group on the western Great Plains: Evidence of late Cenozoic uplift of the Rocky Mountains
Eolian sedimentation and soil development on a semiarid to subhumid grassland, Tertiary Ogallala and Quaternary Blackwater Draw formations, Texas and New Mexico High Plains
The Miocene macroflora of the northern Ogallala Group, northern Nebraska and southern South Dakota
Subsidence beneath a playa basin on the Southern High Plains, U.S.A.: Evidence from shallow seismic data
The axial basins of the northern and central Rio Grande rift evolved since late Oligocene as a chain of half grabens between the Colorado Plateau on the west and the interior of the craton on the east. The basins range from 80 to 240 km in length and from 5 to 95 km in width, with an average width of approximately 50 km. Basin-fill sedimentary deposits range up to 5 to 6 km in thickness. The oldest dated volcanic rocks interbedded with syn-rift sediments are about 26 Ma. Extension in the rift was left oblique and increases southward from 8 to 12% in the San Luis Basin, to about 17% in the northern Albuquerque Basin, to at least 28% in the southern Albuquerque Basin, to an average of 50% in the Socorro area. The most rapid phase of regional extension was middle to late Miocene. Sedimentary deposits of this age are volumetrically dominant within the rift basins and on the rift flanks (Ogallala and Bidahochi Formations). Basin asymmetry shifts back and forth from east-tilted to west-tilted across complex northeast-trending accommodation zones that developed along preexisting transverse structural lineaments. These accommodation zones lie on small circles about the Miocene Euler pole of rotation for the Colorado Plateau relative to the stable craton. Rotation about this Euler pole in northeastern Utah caused synchronous episodes of Miocene extension and sedimentation in the Rio Grande rift and in the central Wyoming-northern Colorado area, largely by the collapse of Laramide uplifts. Late Cenozoic rotation of the Colorado Plateau was 1.0 to 1.5° clockwise. Structural subdivision of basin floors within the rift by longitudinal master faults increased with increasing extension until, at some point in excess of 28% extension, one or more longitudinal fault blocks was uplifted isostatically through the basin surface to form an intrabasin tilted-block mountain range that subdivided the basin. Faulting and subsidence tended to migrate towards the basin axis as newer master faults cut off or merged downdip with, earlier faults. This deactivated the outer longitudinal blocks and left them stranded as shallow suballuvial benches covered by relatively thin sections of the older syn-rift sediments. Recent paleobotanical studies indicate that elevations prior to rifting were similar to present elevations. This suggests that crustal thickening during Laramide compression resulted in regional uplift during the early Cenozoic. Exhumation of the escarpment along the Rocky Mountains-High Plains boundary by erosion of approximately 400 to 600 m of Cenozoic and Cretaceous strata may be a consequence late Cenozoic climate change.