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National Geologic Map Database

Geologic Unit: Lykins

Usage:

Lykins Formation (CO*)


Subunits:

(alphabetical) --all in CO: Bergen Shale Member, Blaine Gypsum Member, Chaquaqua Member, Falcon Limestone Member, Forelle Limestone Member*, Freezeout Member*, Glennon Limestone Member, Harriman Shale Member, Park Creek Limestone Member, [†?]Red Canyon member (informal), Strain Shale Member.


Geologic age:

Permian to Early Triassic*


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

Named from Lykins Gulch, in T. 2 N., R. 71 W., Boulder Co., CO (Fenneman, 1905).


AAPG geologic province:

Denver basin*
Las Animas arch*
Las Vegas-Raton basin*


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 ([ ]).