Usage:
Escondido Formation of Navarro Group (TX,Mexico)
Geologic age:
Late Cretaceous (Maastrichtian; Gulfian Provincial Epoch)*
Type section, locality, area and/or origin of name:
Type locality: near mouth of Rio Escondido (San Antonio), which empties into the Rio Grande (Rio Bravo) about 2 mi below Piedras Negras, Coahuila, Mexico [from American side, about 2 mi below Eagle Pass, Maverick Co., TX] (Dumble, 1892; see Adkins, 1933, Univ. Texas Bull., no. 3232, p. 502+).
AAPG geologic province:
Gulf Coast basin*
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 ([ ]).