Usage:
Darwin Sandstone Member of Amsden Formation (MT*,WY*)
Darwin Sandstone Member of Hartville Formation (WY*)
Originally misspelled Dorwin.
Geologic age:
Middle and Late Mississippian (Meramecian and Chesterian)**
Type section, locality, area and/or origin of name:
Named from exposures on Dorwin [Darwin] Peak, Gros Ventre Range, WY (Blackwelder, 1918).
Reference section: in Tensleep Canyon on west flank, Bighorn Mountains (sta. 190), in T. 47 N., R. 88 W., Washakie Co., WY (Mallory, 1967).
AAPG geologic province:
Bighorn basin*
Denver basin*
Green River basin*
Montana folded belt*
Powder River basin*
Snake River basin*
Wind River basin*
Yellowstone province*
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 ([ ]).