Usage:
Bulan shale member (informal) of /Four Corners Formation of Breathitt Group (KY-recognized locally in Southwestern and Hazard districts)
[Four Corners Formation conflicts with nomenclature guidelines (NACSN, 1983, 2005, 2021).]
Geologic age:
Middle Pennsylvanian (early Moscovian; Westphalian B; middle Atokan)
Type section, locality, area and/or origin of name:
[Type locality not designated. Notable exposures on KY Highway 80 near Bulan, Hazard North 7.5-min quadrangle, Perry Co., eastern KY (see Chesnut, 1991).]
AAPG geologic province:
Appalachian basin
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 ([ ]).