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Image: USGS Dakota Hogback Morrison 1926

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Description: Morrison Formation type locality above the town of Morrison Colorado as designated by Whitman Cross in 1894. The resistant ridge is the Dakota Hogback, composed of the Lytle and Plainview formations. The Morrison Formation is exposed on the slope below the ridge. The white patch above the road is Arthur Lakes Quarry 10 that produced the holotypes of Apatosaurus ajax (YPM 1860), Apatosaurus laticollis (YPM 1861), and Atlantosaurus immanis (YPM l840). The designation of a "new" type by Walschmidt and LeRoy in 1944 several miles farther north was a violation of the North American Stratigraphic Code; it qualifies as a reference section.
Title: USGS Dakota Hogback Morrison 1926
Credit: https://library.usgs.gov/photo/index.html#/item/51dc2a32e4b0f81004b79658
Author: U.S. Geological Survey (Data Owner), Campbell, Marius Robinson (Photographer)
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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