Nilsen, Tor H., and Jr. Clarke, Samuel H.. "Late Cenozoic Basins of Northern California." Tectonics 8, no. 6 (1989): 1137-1158.

Nilsen, Tor H.. Stratigraphy and Sedimentology of the Eocene Tejon Formation, Western Tehachapi and San Emigdio Mountains, California In U. S. Geological Survey Professional Paper. Vol. 1268. Department of the Interior, 1987.

Clarke, Samuel H., Jr., David G. Howell, and Tor H. Nilsen. Paleogene Geography of California., 1975.

Nilsen, Tor H., and Jr. Clarke, Samuel H.. Sedimentation and Tectonics in the Early Tertiary Continental Borderland of Central California In U. S. Geological Survey Professional Paper. Vol. 925. Department of the Interior, 1975.