U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Owl Rock

Usage:

Owl Rock Member of Chinle Formation (AZ*,CO*,NM*,UT*)


Geologic age:

Triassic, Late*


Type section, locality, area and/or origin of name:

Not stated. Origin of name not stated by author, but probably named from Owl Rock (Stewart, 1957).
"Type locality": near base of Owl Rock, Navajo Co., AZ (Witkind and Thaden, 1963).
"Type section": at Owl Rock, about 7.5 mi north of Kayenta (Witkind and Thaden, 1963).


AAPG geologic province:

Plateau sedimentary province*
Black Mesa basin*
San Juan basin*
Paradox basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).