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National Geologic Map Database

Geologic Unit: Paradox

Usage:

Paradox Member of Hermosa Formation (CO,UT)
Paradox Formation of Hermosa Group (AZ*,CO*,NM*,UT*)


Subunits:

FORMATION STATUS: Desert Creek zone.


Geologic age:

Middle Pennsylvanian (early Desmoinesian)*


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

Not designated. Named from exposures in Paradox Valley, Montrose Co., CO. Described from J.H. Shafer No. 1 well, in sec. 16, T. 27 S., R. 20 E., San Juan Co., UT (Baker and others, 1933).
Reference section (subsurface): depth-interval 5,420 to 9,600 ft, Reynolds Mining Company No. 1 Egnar well, in sec. 14, T. 43 N., R. 19 W., San Miguel Co., CO (Baars and others, 1967).


AAPG geologic 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 ([ ]).