Usage:
/Poison Canyon sandstone [zone] (informal) of Westwater Canyon Member of Morrison Formation (NM*)
Informal. the rank or lithologic term should not be capitalized. [Preoccupied. Name previously applied to Poison Canyon Formation of Hills (1888) in CO and NM.]
Geologic age:
Jurassic, Late*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by authors, but probably named from Poison Canyon, McKinley Co., NM (Hilpert and Freeman, 1956).
Type section stated to be near Poison Canyon Mine, Grants district, in sec. 19, T. 13 N., R. 9 W., McKinley Co., NM (Rapaport, 1963).
AAPG geologic province:
San Juan 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 ([ ]).