Sinclair, William John, 1877-1935.; Granger, Walter, 1872-1941.
(New York : Published by order of the Trustees, American Museum of Natural History, 1912)
"1. The Lower Eocene sediments of the Bighorn Basin represent the alluvial filling of an intermontane trough of downwarp. 2. They have been transported from the surrounding mountains as shown by the lithology of the gravels, ...