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National Geologic Map Database

Geologic Unit: McDermott

Usage:

McDermott Member of Animas Formation (CO*,NM*)
McDermott Formation (CO,NM)


Geologic age:

Late Cretaceous*


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

Named from McDermott Arroyo, southwestern La Plata Co., CO. "Typical exposures" [not considered type sections] in secs. 18 and 19, T. 32 N., R. 11 W., La Plata Co., CO., where McDermott is 328 feet thick, conformably overlies Kirtland and unconformably underlies Torrejon (Reeside, 1924).
Typical section on south side of SW/4 NW/4 sec. 19, T. 32 N., R. 11 W., Red Mesa quadrangle, La Plata Co., CO (Barnes and others, 1954).


AAPG geologic province:

San Juan 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 ([ ]).