This report, which was prepared under National Park Service Contract CX
6000-3-0076, leans heavily on the publications of those many people who
have studied various geologic aspects of the Fossil Basin. We would like
to cite particularly Doctors Steven Oriel and Joshua Tracy of the United
States Geological Survey, whose studies have clarified the stratigraphic
relationships of the sediments involved. Dr. D. L. Blackstone, Jr., of
the University of Wyoming supplied information from his yet unpublished
interpretations of the complicated structure of the Idaho-Wyoming thrust
belt. Mr. Tom Bown helped with the structural part of the report and
critically reviewed other parts. The drafting, except for Figs. 3 and 9,
was done by Mr. Evan Groutage. Mrs. Elaine Hertzfeldt, secretary for the
Department of Geology, aided greatly in preparing this manuscript.
Paul O. McGrew
Michael Casilliano
[Illustration: DEPARTMENT OF THE INTERIOR · MARCH 3 1849; NATIONAL
PARK SERVICE]