Later Tertiary Equidae from the Tejon Hills, California

Fossil vertebrates were first discovered in continental sediments of the Tejon Hills (for location see fig. 1) in 1911, by R. W. Pack, of the U. S. Geological Survey. The occurrence of these fragmentary specimens was briefly described at a meeting of the Pacific Coast Paleontological Society in 1913 (Merriam and Pack, 1913). Thereafter some collecting was done by the University of California party of 1915, the results of which were presented in papers by Merriam (1915a, 1915b, 1916). During the latter part of 1928, field parties of the California Institute of Technology obtained a much larger fauna than that previously collected in the Tejon Hills. As a result of further field work by R. W. Wilson, R. M. Leard, Jack Dougherty, and the writer in 1938, considerable fossil material was obtained from this area, and the existence of three distinct faunas was disclosed. These were collected at seven localities along the ridge to the south and west of Comanche Creek (see map, fig. 2).