Usage:
Ignacio Quartzite (AZ*,CO*,NM*,UT*)
Subunits:
(alphabetical) --all in CO: Spud Hill Member, Tamarron Member.
Geologic age:
Late Cambrian(?) or Late Devonian(?)
Type section, locality, area and/or origin of name:
Named from development on bench where Ignacio Lake is situated, [Electra Lake 7.5-min quadrangle, La Plata Co.], southwestern CO (Cross, 1901).
AAPG geologic province:
Black Mesa basin*
Paradox basin*
San Juan basin*
San Juan Mountains province*
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 ([ ]).