The Chinle (Upper Triassic) and Sundance (Upper Jurassic) Formations in north-central Colorado : a description of hitherto unreported or little-understood stratigraphic and paleontologic details of marine Jurassic and Upper Triassic rocks of a scantily studied area / G.N. Pipiringos, W.J. Hail, Jr., and G.A. Izett.
Publication Info.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1969.
Washington : United States Government Printing Office
Description of hitherto unreported or little-understood stratigraphic and paleontologic details of marine Jurassic and Upper Triassic rocks of a scantily studied area