Usage:
Masuk Member of Mancos Shale (UT*)
Masuk Tongue of Mancos Shale (UT)
Masuk Formation (UT)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Type section: east side of Blind Trail on west-facing cliff, in SE/4 NE/4 sec. 27, T. 31 S., R. 8 E., through SW/4 NW/4 sec. 26, T. 31 S., R. 8 E., Garfield Co., UT (Eaton, 1990).
Described from Masuk Plateau [Tarantula Mesa, approx. Lat. 38 deg. 00 min. 05 sec. N., Long. 110 deg. 52 min. 41 sec. W., Steele Butte 7.5-min quadrangle, Garfield Co., UT], northwest of Mount Pennell and southwest of Mount Ellen (Gilbert, 1877; Hunt and others, 1953; additional locality information from USGS GNIS database and ACME Mapper 2.0, accessed August 28, 2009).
AAPG geologic province:
Paradox 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 ([ ]).