McAlester Formation
Stratigraphic range: Pennsylvanian

Type| Formation
Unit of| none
Sub-units| Lower and Upper Hartshorne coal beds, and the McAlester coal bed
Underlies| Savanna Formation
Overlies| Hartshorne Sandstone
Thickness| 500 to 2,300 feet[1]
Lithology
Primary| Shale
Location
Region| Arkansas, Oklahoma
Country| United States
Type section
Named by| J.A. Taff[2]

The McAlester Formation is a Pennsylvanian geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. Early descriptions of this unit considered it to be part of the Coal Measures,[3] part of the Upper or Western Coal Bearing Division,[4] the Spadra Stage and part of the Sebastian Stage,[3] and part of the Cavaniol Group.[5] In 1899, J.A. Taff introduced the McAlester Formation name in his study of the Ouachita Mountains of Oklahoma.[2] The name was introduced into Arkansas in 1907 as the McAlester Group, where it consisted of the formations known as the Spadra Shale, the Fort Smith Formation, and the Paris Shale.[6] These formations was redefined and replaced in 1960, when the McAlester Shale replaced the Spadra Shale and the lower Fort Smith Formation.[7] The McAlester Formation is informally recognized with three sub-units in Arkansas: the Lower and Upper Hartshorne coal beds,[1] and the McAlester coal bed.[8] Taff assigned the type locality near the town of McAlester in Pittsburg County, Oklahoma, however he did not state whether the town is the origin of the name. Taff did not designate a stratotype and, as of 2017, a reference section for the McAlester Formation has not been designated.

## See also

* List of fossiliferous stratigraphic units in Arkansas
* Paleontology in Arkansas

## References

1. ↑ 1.0 1.1 McFarland, John David (2004). "Stratigraphic summary of Arkansas". Arkansas Geological Commission Information Circular 36: 24. http://geology.ar.gov/pdf/IC-36_v.pdf. Retrieved 2018-01-10.
2. ↑ 2.0 2.1 Taff, J.A. (1899). "Geology of the McAlester-Lehigh coal field, Indian Territory". Nineteenth Annual Report of the United States Geological Survey 3: 437.
3. ↑ 3.0 3.1 Stevenson, John James (1896). "Notes on the geology of Indian Territory". Transactions of the New York Academy of Sciences 15: 50–61. https://www.biodiversitylibrary.org/item/45930.
4. ↑ Winslow, A. (1888). "The geology of the coal regions; a preliminary report upon a portion of the coal regions of Arkansas". Annual Report of the Geological Survey of Arkansas for 1888 3. http://geology.ar.gov/pdf/Ann_rpt_1888_Vol3.pdf.
5. ↑ Drake, N.F. (1897). "A geological reconnaissance of the coal fields of the Indian Territory". Proceedings of the American Philosophical Society 36: 326–419. https://www.biodiversitylibrary.org/bibliography/7023.
6. ↑ Collier, A.J. (1907). "The Arkansas coal field". U.S. Geological Survey Bulletin 326. https://pubs.usgs.gov/bul/0326/report.pdf.
7. ↑ Haley, Boyd R. (1960). "Coal resources of Arkansas, 1954". U.S. Geological Survey Bulletin 1072-P: 795–831. https://pubs.usgs.gov/bul/1072p/report.pdf.
8. ↑ Haley, Boyd R.; Hendricks, Thomas A. (1968). "Geology of the Greenwood quadrangle". U.S. Geological Survey Professional Paper 536-A. https://pubs.usgs.gov/pp/0536a/report.pdf.

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