Usage:
Hammett Shale (TX)
Hammett Shale Member of Travis Peak Formation of Trinity Group (TX)
Hammett Shale Member of Pearsall Formation of Trinity Group (TX)
Geologic age:
Early Cretaceous
Type section, locality, area and/or origin of name:
Type section (subsurface): completely cored section at Hamilton Pool coreholes 1 and 2. Named from Hammett Crossing, about 1 mi west of Hamilton Pool in western Travis Co., central eastern TX (Lozo and Stricklin, 1956).
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 ([ ]).