Usage:
East Tioga Clay [unranked] in Golden Valley Formation (ND-recognized locally in Mountrail Co.)
Geologic age:
early Tertiary (Eocene)
Type section, locality, area and/or origin of name:
Notable exposures on Great Northern mainline in center sec. 33, T. 157 N., R. 94 W., Mountrail Co., western ND (Great Northern Railway Company, 1958).
AAPG geologic province:
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 ([ ]).