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National Geologic Map Database

Geologic Unit: Dyer

Usage:

Dyer Member of Chaffee Formation (CO*)
Dyer Dolomite of Chaffee Group (CO*)
Dyer Formation of Chaffee Group (CO)


Subunits:

FORMATION STATUS (alphabetical) --all in CO: Broken Rib Member, Coffee Pot Member.


Geologic age:

Late Devonian or Early Mississippian(?)*


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

Named from exposures on West Dyer and Dyer Mountains, 5 mi east of Leadville, Lake Co., CO (Behre, 1932).


AAPG geologic province:

Eagle basin*
South Park basin*
Piceance basin*
Green River 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 ([ ]).