Usage:
Jonah Limestone of Austin Group (TX)
Jonah Formation of Austin Group (TX)
Geologic age:
Late Cretaceous (Gulfian Provincial Epoch, Austinian Provincial Age)
Type section, locality, area and/or origin of name:
Type locality not stated. Occurs in type section of Austin Group, in vicinity of Austin, Williamson Co., central eastern TX (Murray, 1961, citing Durham, 1957, unpub. PhD dissert., Columbia Univ.).
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 ([ ]).