Usage:
No current usage.
(Rocks of †EXOGYRA ARIETINA clay or †EXOGYRA ARIETINA marl (TX) reallocated to Del Rio Clay. See Del Rio.)
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Paleontologic name for Lower Cretaceous beds in TX that were later named Del Rio Clay (US geologic names lexicon, USGS Bull. 896).
Notable exposures on Shoal Creek and toward base of Mt. Bonnell, near Austin, Travis Co., central eastern TX (Shumard, 1860).
AAPG geologic province:
Ouachita folded belt
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 ([ ]).