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National Geologic Map Database

Geologic Unit: Montoya

Usage:

Montoya Group (NM*,TX*)
Montoya Dolomite (NM*,TX*)
Montoya Formation (NM*)


Subunits:

GROUP STATUS (alphabetical): Aleman Formation (NM*,TX*) or Aleman Dolomite (NM*), Cable Canyon Sandstone (NM*,TX*), Cutter Dolomite (NM*,TX*) or Cutter Formation (NM*,TX*), Rio Mimbres Sandstone (NM,TX), Second Value Dolomite (NM*,TX*), Upham Dolomite (NM,TX*).
FORMATION STATUS (alphabetical): Aleman Member (NM*,TX*) or Aleman Dolomite Member (NM*), Cable Canyon Sandstone Member (NM*,TX*), Cutter Member (NM*,TX*) or Cutter Dolomite Member (NM*), Second Value Member (NM*), Upham Member (NM*,TX*).


Geologic age:

Late Ordovician (Cincinnatian)*


Type section, locality, area and/or origin of name:

Not designated. Origin of name not stated. Occurs in El Paso and Van Horn quadrangles, El Paso and Culberson Cos., TX (Richardson, 1908).


AAPG geologic province:

Basin-and-Range province*
Orogrande basin*
Pedregosa basin*
Permian 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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).