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National Geologic Map Database

Geologic Unit: Bulan

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).]


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).