Stratigraphic column of the Brushy Basin Member of Morrison Formation, Cleveland-Lloyd Dinosaur Quarry. Brontosaurus - Wikipedia As part of a study of the carnotite deposits of the Colorado Plateau,, samples of ground water from the Salt Wash sandstone and Brushy Basin shale members of the Morrison formation have been analyzed to determine their chemical character and metal content. The Brushy Basin Member and the upper part of the Westwater Canyon Member of the Morrison Formation in northwest New Mexico are nonmarine sedimentary rocks of Late Jurassic age. Windy Hill Member: The oldest member. Morrison Formation Salt Wash: Middle member of the Morrison Formation consisting of sands and gravels deposited as seasonal rains in . The Brushy Basin and Recapture Members of the Morrison Formation, classified as shales, are very fine-grained and have a very low permeability. Morrison Formation, San Juan Basin | Bureau of Economic Geology The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States, which has been the most fertile source of dinosaur fossils in North America. Before the extension of members of the Morrison Formation into The record of volcanism in the Brushy Basin Member of the Morrison Formation: Implications for the Late Jurassic of western North America. . These dates range from 145 ± 1.2 Ma to 149 ± 0.7 Ma; thus the Brushy Basin Member is Tithonian and/or earliest Berriasian in age according to the timescale of Harland et al. Age of the Brushy Basin Member of the Morrison Formation, Colorado ... Three primary clastic lithofacies are present in both the Brushy Basin Member and at Gale Crater: silt . [1990]. River-channel sandstones embedded in the floodplain mudstones tend to have cut down to resistant caliche paleosols.