Stewart, J.H., and Carlson, J.E., 1978, Generalized maps showing distribution, lithology, and age of Cenozoic igneous rocks in the western United States, in Smith, R. B., and Eaton, G.P., eds., Cenozoic tectonics and regional geophysics of the western Cordillera: Geological Society of America Memoir 152, p. 263-264, 2 sheets, scale 1:5,000,000.
Stewart, J.H., 1980, Regional tilt patterns of late Cenozoic basin-range fault blocks, western United States: Geological Society of America Bulletin, v. 91, no. 8, p. 460-464.
Stewart, J.H., 1978, Basin-Range structure in western North America: A review, in Smith, R.B., and Eaton, G.P., eds., Cenozoic tectonics and regional geophysics of the western Cordillera: Geological Society of America Memoir 152, p. 1-31.
Steven, T.A., Smedes, H.W., Prostka, H.J., Lipman, P.W., and Christiansen, R.L., 1972, Upper Cretaceous and Cenozoic igneous rocks, in Mallory, W.W., ed.-in-chief, Geologic atlas of the Rocky Mountain region: Denver, Rocky Mountain Association of Geologists, p. 229-232.
Spencer, J.E., and Welty, J.W., 1986, Possible controls of base- and precious-metal mineralization associated with Tertiary detachment faults in the lower Colorado River trough, Arizona and California: Geology, v. 14, no. 3, p. 195-198.
Spencer, J.E., and Reynolds, S.J., 1990, Relationship between Mesozoic and Cenozoic tectonic features in west central Arizona and adjacent southeastern California: Journal of Geophysical Research, v. 95, no. B1, p. 539-555.
Spencer, J.E., and Reynolds, S.J., 1987, Interaction between Mesozoic and Cenozoic tectonic features in the Buckskin Mountains and adjacent areas, west-central Arizona and southeastern California [abs.]: Geological Society of America Abstracts with Programs, v. 19, no. 7, p. 852-853.
Spencer, J.E., and Reynolds, S.J., 1986, Relationship of the Transition Zone to Mesozoic and Cenozoic tectonism in the Basin and Range Province, Ariz.[abs.]: Geological Society of America Abstracts with Programs, v. 18, no. 5, p. 415.
Spamer, E.E., 1989, The development of geological studies in the Grand Canyon - prepared for the 28th International Geological Congress Colorado River field trips through the Grand Canyon, Lees Ferry to Temple Bar, Lake Mead, Arizona, June-July 1989: Tryonia, no. 17 (Contribution of the Invertebrate Paleontology Section, no. 1), 87 p.
Snyder, W.S., Dickinson, W.R., and Silberman, M.L., 1976, Tectonic implications of space-time patterns of Cenozoic magmatism in the western United States: Earth and Planetary Science Letters, v. 32, p. 91-106.