Usage:
Blackgum Formation (OK)
Blackgum Formation of /Chimneyhill subgroup [informal] of Hunton Group (OK)
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Chimneyhill subgroup considered informal and should not be capitalized.]
Subunits:
Pettit Oolite Member (OK).
Geologic age:
Silurian
Type section, locality, area and/or origin of name:
Type locality: at Blackgum Landing on southeast shore of Lake Tenkiller, in SW/4 SE/4 sec. 32, T. 14 N., R. 22 E., Cherokee Co., northeastern OK (Amsden and Rowland, 1965).
AAPG geologic province:
not stated
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 ([ ]).