Geology of National Parks, 3D and Photographic Tours
|Usage of Geologic Unit Name:
Is a formation of Unkar Group of Grand Canyon Supergroup.
Southern Rocky Mountain region*
Not compiled to date
|Unit Name History:
Isotopic dating (McKee and Noble, 1976). Revised, replaces use of Rama Formation (Ford and Breed, 1973). Revised, assigned to Unkar Group of Grand Canyon Supergroup (Elston and Scott, 1976). Revised (Stevenson, Beus, 1982). Isotopic dating; Redescribed: Overview (Beus and Lucchitta, 1987). Overview (Hendricks, 1989). Isotopic dating; Paleomagnetics; Redescribed (Elston, 1989b).
Ford, T.D. and Breed, W.J., 1973, Late Precambrian Chuar Group, Grand Canyon, Arizona: Geological Society of America Bulletin, v. 84, no. 4, p. 1243-1260.
McKee, E.H. and Noble, D.C., 1976, Age of the Cardenas Lavas, Grand Canyon, Arizona: Geological Society of America Bulletin, v. 87, no. 8, p. 1188-1190.
Elston, D.P. and Scott, G.R., 1976, Unconformity at the ardenas-Nankoweap contact (Precambrian), Grand Canyon Supergroup, northern Arizona: Geological Society of America Bulletin, v. 87, no. 12, p. 1763-1772.
Stevenson, G.M. and Beus, S.S., 1982, Stratigraphy and depositional setting of the upper Precambrian Dox Formation in Grand Canyon: Geological Society of America Bulletin, v. 93, no. 2, p. 163-173.
Beus, S.S. and Lucchitta, Ivo, 1988, Field Trip Guide for Marble Canyon and eastern Grand Canyon, IN Davis, G.H., and VandenDolder, E.M., editors, Geologic diversity of Arizona and its margins; Excursions to choice areas: Arizona Geological Survey Special Paper, no. 5, Geological Society of America, 100th Annual Meeting, Phoenix, AZ, October 26-29, 1987, p. 3-19.
Hendricks, J.D., 1989, Petrology and chemistry of igneous rocks of Middle Proterozoic Unkar Group, Grand Canyon Supergroup, northern Arizona, IN Elston, D.P., Billingsley, G.H., and Young, R.A., editors, Geology of Grand Canyon, northern Arizona (with Colorado River guides); Lees Ferry to Pierce Ferry, Arizona; guidebook to field trips T115 and T315: Internationa Geological Congress, 28th, Field Trip Guidebook, T115, T315, Washington, DC, 1989, p. 106-116.
Elston, D.P., 1989, Grand Canyon Supergroup, northern Arizona; stratigraphic summary and preliminary paleomagnetic correlations with parts of other North American Proterozoic successions, IN Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest, v. 17, p. 259-272.
* show accepted USGS usage. Note that data on this page is modified from information available via the
National Geologic Map Database GEOLEX: