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National Geologic Map Database

Geologic Unit: Ignacio

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 ([ ]).