Usage:
Hilliard Shale (WY*, and UT*-local)
Hilliard Formation (WY*)
Subunits:
(alphabetical): Hinshaw Member (WY), Shurtliff Member (WY*).
Geologic age:
Late Cretaceous (Coniacian to Santonian)*
Type section, locality, area and/or origin of name:
Typical section: shale beds west of Kemmerer, Lincoln Co., and extending as far as east portal of Oregon Short Line tunnel, WY [in T. 21 N., R. 116 W., Kemmerer 7.5-min quadrangle, Lincoln Co., southwestern WY]. Named from town of Hilliard, which is located on the formation. [Hilliard, in NW/4 sec. 2, T. 13 N., R. 119 W., Lat. 41 deg. 08 min. 16 sec. N., Long. 110 deg. 48 min. 43 sec. W., Sulphur Creek Reservoir 7.5-min quadrangle, Uinta Co., southwestern WY] (Knight, 1902, 1903).
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 ([ ]).