1. Cosmogenic He-3 and Ne-21 production rates calibrated against Be-10 in minerals from the Coso volcanic field;Amidon;Earth Planet. Sci. Lett.,2009
2. Temperature-induced 4He degassing of specularite and botryoidal hematite: a 4He retentivity study;Bahr;J. Geophys. Res.,1994
3. Billingsley, G.H., 2000. Geologic Map of the Grand Canyon 30′×60′ Quadrangle, Coconino and Mohave Counties, Northwestern Arizona, Geologic Investigations Series I2688. United States Geological Survey.
4. Billingsley, G.H., Beus, S.S., 1985. The Surprise Canyon Formation: An Upper Mississippian and Lower Pennsylvanian(?) Rock Unit in the Grand Canyon, Arizona. Stratigraphic Notes, Bulletin of the U.S. Geological Survey 1605-A, pp. A27–A33.
5. Billingsley, G.H., Priest, S.S., 2010. Geologic Map of the House Rock Valley Area, Coconino County, Northern Arizona, Scientific Investigations Map 3108. United States Geological Survey.