Usage:
Putnam Group (TX)
Putnam Formation of Wichita Group (TX*)
Putnam Formation of Cisco Group (TX)
Subunits:
GROUP STATUS (alphabetical) --all in TX: Coleman Junction Formation, Santa Anna Branch Formation.
FORMATION STATUS (alphabetical) --all in TX*: Coleman Junction Limestone Member, Santa Anna Branch Shale Member.
Geologic age:
early Permian (Wolfcampian)*
Type section, locality, area and/or origin of name:
Not designated. "Typically exposed" on the hillside west of town of Putnam, Callahan Co., TX (Plummer and Moore, 1922).
AAPG geologic province:
Bend arch*
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 ([ ]).