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  • All fields: Arikaree
(7 results)



Display: 20

    • Tetrabelodon excavation

    • Paleontology--Fieldwork; Paleontology; Paleontological excavations
    • "At Tetrabelodon quarry in Arikaree sand. View showing quarry face. Mandible, pelvis, and skull." Side view of a man and two boys excavating fossils from a steep hillface. The man is standing and using a shovel, and the boys are both kneeling...
    • Chimney Rock sketch

    • Chimney Rock (Neb.); Geology--Nebraska; Rock formations--Nebraska; Nebraska Western Trails Project NSHS
    • Abstract The younger Arikaree deposits, carried by water, covered the older Brule formation. The latter is hundreds of feet thick. Repeated cycles followed: wind deposition and erosion, stream deposition and erosion.
    • Chimney Rock model

    • Chimney Rock (Neb.); Geology--Nebraska; Rock formations--Nebraska; Nebraska Western Trails Project NSHS
    • Abstract Chimney Rock is mainly composed of Brule clay, not ôrock,ö with horizontal layers of volcanic ash and sandstone. The soft clay erodes easily, while the hard sandstone does not. The presence of the protective sandstone cap may explain...
    • Chimney Rock model

    • Chimney Rock (Neb.); Geology--Nebraska; Rock formations--Nebraska; Nebraska Western Trails Project NSHS
    • Abstract Chimney Rock is mainly composed of Brule clay, not ôrock,ö with horizontal layers of volcanic ash and sandstone. The soft clay erodes easily, while the hard sandstone does not. The presence of the protective sandstone cap may explain...

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