Usage:
Ferris Formation (WY*)
Geologic age:
Late Cretaceous and early Tertiary (Maastrichtian and early Paleocene)*
Type section, locality, area and/or origin of name:
Type locality: from old Ferris Ranch on North Platte River [now submerged; in NW/4 sec. 33, T. 23 N., R. 84 W.], east to top of hill north of "Middle Ditch" at its junction with "Big Ditch" [in sec. 28, T. 23 N., R. 83 W., Walcott quadrangle (1914 ed.), scale 1:125,000], Carbon Co., central southern WY (Bowen, 1918; Gill and others, 1970).
AAPG geologic province:
Green River 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 ([ ]).