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  • All fields: formations--Nebraska
(13 results)



Display: 20

    • 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 sketch

    • Chimney Rock (Neb.); Geology--Nebraska; Rock formations--Nebraska; Nebraska Western Trails Project NSHS
    • Abstract About four or five million years ago the rate of erosion, especially by streams, exceeded the rate of deposition. This plain, which once was as high as the top of the Wildcat Ridge, began to erode away.
    • Chimney Rock sketch

    • Chimney Rock (Neb.); Geology--Nebraska; Rock formations--Nebraska; Nebraska Western Trails Project NSHS
    • Abstract Erosion carried away vast amounts of sediment and left the present landscape. Chimney Rock remained as an isolated remnant of this former great plain, along with Courthouse Rock, ScottÆs Bluff, and the Wildcat Hills.
    • 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...
    • Auto-Touring Banner County, Nebraska

    • Automobiles -- Nebraska -- 1920-1930; Rock formations -- Nebraska -- Banner County -- 1920-1930
    • Abstract This undated photograph shows auto-touring in Banner County. The automobile is parked on a dirt track amid interesting rock formations.
    • Chimney Rock sketch

    • Chimney Rock (Neb.); Geology--Nebraska; Rock formations; Nebraska Western Trails Project NSHS
    • Abstract About 35 million years ago, thick sediments carried by wind and streams began to cover the present Nebraska panhandle. Wind-deposited sediments in the form of ash originated with volcanic eruptions to the west. Volcanic activity and...

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