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National Geologic Map Database

Geologic Unit: Four Corners

Usage:

/Four Corners Formation of Breathitt Group (KY)

[Four Corners not an appropriate geographic term. Conflicts with nomenclature guidelines (NACSN, 1983, 2005).]


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