McAlester Formation (OKPAm;0)

State	Oklahoma
Name	McAlester Formation
Geologic age	Middle Pennsylvanian
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Mudstone > Shale (Bed) Incidental Sedimentary > Coal (Bed)
Comments	First published use in Pittsburg Co, OK, in the Arkoma basin. Probably named for the town of McAlester. No type locality designated. Occurs in the McAlester coal district in the McAlester quadrangle, and in the Lehigh coal district in the Atoka and Colgate quadrangles. In the McAlester coal district, consists of (ascending): 1) 800 ft of shale, with thin sandstone and coal, and Hartshorne or Grady coal occurring near base of shale; 2) three to four beds of sandstone separated by shale 100-200 ft thick, together this sandstone and shale is 500 ft thick; and 3) 700 ft of shale with the McAlester coal about 50 ft above its base--shale is blue, gray, or black with the gray color predominant. In the Lehigh coal district, consists generally of cherty sandstone beds and two workable coal beds. (Taff, 1899).
References	Heran, W.D., Green, G. and Stoeser, D.B., 2003, A Digital Geologic Map Database of Oklahoma: USGS Open File Report 03-247, scale 1:250,000. https://pubs.er.usgs.gov/publication/ofr03247 Hart, D.L., 1974, Reconnaissance of the water resources of the Ardmore and Sherman quadrangles, southern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 3, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by D.L. Hart, and R.O. Fay, in 1970.) Cederstrand, J.R., 1996a, Digital geologic map of Ardmore-Sherman quadrangles, south-central Oklahoma: U.S. Geological Survey Open-File Report 96-370, (3 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology https://pubs.er.usgs.gov/publication/ofr96370 Marcher, M.V. and Bergman, D.L., 1983, Reconnaissance of the water resources of the McAlester and Texarkana quadrangles, southeastern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 9, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by M.V. Marcher and D.L. Bergman, in 1971 and revised by R.O. Fay, in 1978.) Cederstrand, J.R., 1996h, Digital geologic map of McAlester-Texarkana quadrangles, southeastern Oklahoma: U.S. Geological Survey Open-File Report 96-377, (3 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology https://pubs.er.usgs.gov/publication/ofr96377 Taff, J.A., 1899, Geology of the McAlester-Lehigh coal field, Indian Terri-tory: U.S. Geological Survey, 19th Annual Report, pt. 3, p. 429-456. https://pubs.er.usgs.gov/publication/ar19_3
NGMDB product	NGMDB product page for 55294
Counties	Atoka - Coal - Latimer - Le Flore - Pittsburg - Pontotoc

State

Oklahoma

Name

McAlester Formation

Geologic age

Middle Pennsylvanian

Lithologic constituents

Major

Sedimentary > Clastic > Sandstone (Bed)

Sedimentary > Clastic > Mudstone > Shale (Bed)

Incidental

Sedimentary > Coal (Bed)

Comments

First published use in Pittsburg Co, OK, in the Arkoma basin. Probably named for the town of McAlester. No type locality designated. Occurs in the McAlester coal district in the McAlester quadrangle, and in the Lehigh coal district in the Atoka and Colgate quadrangles. In the McAlester coal district, consists of (ascending): 1) 800 ft of shale, with thin sandstone and coal, and Hartshorne or Grady coal occurring near base of shale; 2) three to four beds of sandstone separated by shale 100-200 ft thick, together this sandstone and shale is 500 ft thick; and 3) 700 ft of shale with the McAlester coal about 50 ft above its base--shale is blue, gray, or black with the gray color predominant. In the Lehigh coal district, consists generally of cherty sandstone beds and two workable coal beds. (Taff, 1899).

References

Heran, W.D., Green, G. and Stoeser, D.B., 2003, A Digital Geologic Map Database of Oklahoma: USGS Open File Report 03-247, scale 1:250,000.

https://pubs.er.usgs.gov/publication/ofr03247

Hart, D.L., 1974, Reconnaissance of the water resources of the Ardmore and Sherman quadrangles, southern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 3, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by D.L. Hart, and R.O. Fay, in 1970.)

Cederstrand, J.R., 1996a, Digital geologic map of Ardmore-Sherman quadrangles, south-central Oklahoma: U.S. Geological Survey Open-File Report 96-370, (3 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology

https://pubs.er.usgs.gov/publication/ofr96370

Marcher, M.V. and Bergman, D.L., 1983, Reconnaissance of the water resources of the McAlester and Texarkana quadrangles, southeastern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 9, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by M.V. Marcher and D.L. Bergman, in 1971 and revised by R.O. Fay, in 1978.)

Cederstrand, J.R., 1996h, Digital geologic map of McAlester-Texarkana quadrangles, southeastern Oklahoma: U.S. Geological Survey Open-File Report 96-377, (3 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology

https://pubs.er.usgs.gov/publication/ofr96377

Taff, J.A., 1899, Geology of the McAlester-Lehigh coal field, Indian Terri-tory: U.S. Geological Survey, 19th Annual Report, pt. 3, p. 429-456.

https://pubs.er.usgs.gov/publication/ar19_3

NGMDB product

NGMDB product page for 55294

Counties

Atoka - Coal - Latimer - Le Flore - Pittsburg - Pontotoc