Usage:
Morton Member of Fall River Formation of Inyan Kara Group (MT,SD,WY)
Geologic age:
Early Cretaceous
Type section, locality, area and/or origin of name:
Type section (subsurface): Dan C. Morton, Morton No. 1 well, in SW/4 NE/4 sec. 15, T. 54 N., R. 68 W., Crook Co., WY (Bolyard and McGregor, 1966).
AAPG geologic province:
Powder River basin
Williston 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 ([ ]).