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National Geologic Map Database

Geologic Unit: Lyons

Usage:

Lyons Sandstone (CO*)


Geologic age:

Early Permian*


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

Best developed at Lyons, a few mi north of Boulder distrcit as mapped, [Boulder Co.], central northern CO, where it is quarried in large amounts (Fenneman, 1905; see Lee, 1927).


AAPG geologic province:

Denver basin*
Las Animas arch*


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).