Galeros Formation

Usage of Geologic Unit Name:
Galeros Formation* of Chuar Group of Grand Canyon Supergroup
Proterozoic, Late*
Proterozoic Y*
Geologic Province:
Southern Rocky Mountain region*
Plateau sedimentary province*
Areal Extent:

Type Locality:
Type section: Galeros Promontory in Chuar and Carbon Canyons, Grand Canyon, lat 36 12'00" N, long 111 50'00" W, Coconino Co., AZ. Named for Galeros promontory, west of Colorado River, Coconino Co, AZ (Ford, Breed, 1973).

Tanner, Jupiter, Carbon Canyon, Duppa Members

Unit Name History:
First used (Ford and Breed, 1972). Named basal formation of Chuar Group; divided into Tanner, Jupiter, Carbon Canyon, Duppa Members (Ford, Breed, 1973). Adopted as Galeros Formation of Chuar Group of Grand Canyon Supergroup (Elston, 1979). Age modified (Elston, 1982). Age modified (Elston, 1989b).


Ford, T.D. and Breed, W.J., 1972, The Chuar Group of the Proterozoic, Grand Canyon, Arizona, IN Geologie du Precambrian, Section 1: International Geological Congress, 24th, Report, no. 1, Montreal, 1972, p. 3-10.

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.

Elston, D.P., 1979, Late Precambrian Sixtymile Formation and orogeny at top of the Grand Canyon Supergroup, northern Arizona: U.S. Geological Survey Professional Paper, 1092, 20 p.

Elston, D.P., 1981, Paleomagnetic correlations of Proterozoic rocks [abs.]: U.S. Geological Survey Professional Paper, 1275, p. 139.

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.

Dodson, Crystal L., Crossey, Laura J., Bloch, John D., Dehler, Carol M., 2002, Major element geochemistry of the Neoproterozoic Chuar Group, Grand Canyon: New Mexico Geology, v. 24, no. 2, p. 64.

Uphoff, Thomas L., 1997, Precambrian Chuar source rock play., an exploration case history in
southern Utah: AAPG Bulletin, v. 81, no. 1, p. 1-15.

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Last modified: 1/7/2011