Usage:
/Four Corners Formation of Breathitt Group (KY)
[Four Corners not an appropriate geographic term. Conflicts with nomenclature guidelines (NACSN, 1983, 2005, 2021).]
Subunits:
(alphabetical) --all in KY: Arnett Member, Bulan shale member (informal), Magoffin Member, Reynolds Sandstone Member.
Geologic age:
Middle Pennsylvanian (early Moscovian; Westphalian B; middle Atokan)
Type section, locality, area and/or origin of name:
Type locality: four roadcuts arranged around the intersection of the Daniel Boone Parkway, KY Highway 80, and KY Highway 15, [btw. Bonnyman and Airport Gardens, approx. Lat. 37 deg. 17 min. 17 sec. N., Long. 83 deg. 13 min. 15 sec. W., Hazard North 7.5-min quadrangle], Perry Co., eastern KY (Chesnut, 1992).
Reference section (subsurface): USGS No. 11 diamond drillhole, Vicco quadrangle, Perry Co., eastern KY (Chesnut, 1992).
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 ([ ]).