Usage:
Hayden Formation (ND,SD)
Hayden Member of Hartville Formation (NE,WY)
Geologic age:
Middle Pennsylvanian (Desmoinesian)
Type section, locality, area and/or origin of name:
Hayden Cliff, in sec. 22, T. 27 N., R. 66 W., Platte Co., WY. Named from Hayden Cliff (Condra and others, 1940).
AAPG geologic province:
Chadron arch
Denver 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).