Tertiary igneous rocks of the Navajo country, Arizona, New Mexico and Utah, in James, H.L., ed., Guidebook of Monument Valley and vicinity, Arizona and Utah

Fitzsimmons, J.P., 1973, Tertiary igneous rocks of the Navajo country, Arizona, New Mexico and Utah, in James, H.L., ed., Guidebook of Monument Valley and vicinity, Arizona and Utah: New Mexico Geological Society 24th Field Conference Guidebook, p. 106-109.