Lykins Formation (CO*)
(alphabetical): Blaine Gypsum Member (CO), Bergen Shale Member (CO), Falcon Limestone Member (CO,WY), Forelle Limestone Member (CO*), Glennon Limestone Member (CO), Harriman Shale Member (CO), Park Creek Limestone Member (CO), Chaquaqua Member (CO), ?Red Canyon member (informal) (CO), Strain Shale Member (CO).
Triassic(?)* or Permian, Late*
Named from Lykins Gulch, in T. 2 N., R. 71 W., Boulder Co., CO (Fenneman, 1905).
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 ([ ]).