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National Geologic Map Database

Geologic Unit: Edwards

Usage:

Edwards Formation (TX)
Edwards Limestone of Fredericksburg Group (TX*)
Edwards Group (TX-recognized on eastern Edwards Plateau)


Subunits:

GROUP STATUS (alphabetical) --all in TX: Fort Terrett Formation, Kainer Formation, Person Formation, Segovia Formation.


Geologic age:

late Early Cretaceous (Albian; Comanchean Provincial Epoch)*


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

Type locality: Barton Creek, near Austin, [Travis Co.], central eastern TX (Adkins, 1933).
Named from Edwards Plateau, Nueces and Uvalde quadrangles, southwestern TX, of which it is chief component of scarps and mesas (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Bend arch*
Gulf Coast basin*
Kerr basin*
Llano uplift*
Ouachita folded belt*
Permian basin*
Strawn basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).