Usage:
Navarro Group (LA*,TX*)
Navarro Formation (AL?,TX*)
Subunits:
GROUP STATUS (alphabetical): Arkadelphia Marl (LA,TX), Corsicana Formation (TX*) or Corsicana Marl (TX*), Escondido Formation (TX), Kemp Clay (TX*) or Kemp Formation (TX*), Nacatoch Sand (LA,TX*), Neylandville Marl (TX*), Olmos Formation (TX*), Saratoga Formation (LA).
Geologic age:
Late Cretaceous (Campanian to Maastrichtian; Gulfian Provincial Epoch)*
Type section, locality, area and/or origin of name:
Named from development in Navarro Co., eastern TX (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
East Texas 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 ([ ]).