Collier Shale

The Collier Shale is a geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. Dating from the Late Cambrian to Early Ordovician periods, the Collier Shale is the oldest stratigraphic unit exposed in Arkansas. First described in 1892,[2] this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas.[1][3] Purdue assigned the type locality to the headwaters of Collier Creek in Montgomery County, Arkansas, but did not designate a stratotype. As of 2017, a reference section for this unit has yet to be designated.

Collier Shale Stratigraphic range: Cambrian-Ordovician
Type	Formation
Unit of	none
Sub-units	none
Underlies	Crystal Mountain Sandstone
Lithology
Primary	Shale
Location
Region	Arkansas, Oklahoma
Country	United States
Type section
Named for	Collier Creek, Montgomery County, Arkansas[1]
Named by	Albert Homer Purdue

Paleofauna

Conodonts

Acanthodus A. lineatus[4] Acodus A. oneotensis[4] Chosonodina C. herfurthi[4][5] Cordylodus C. angulatus[4][5] Drepanodus D. subarcuatus[4]

Loxodus L. bransoni[5] Oistodus O. triangularis[4] Paltodus P. bassleri[5] Phakelodus P. tenuis[5]

Trilobites

Anechocephalus A. aphelodermus[6] Apachia A. genaitholix[7] Aphelotoxon A. lumaleasa[7] Buttsia B. drabensis[5] Cernuolimbus C. monilis[6] Cheilocephalus C. brachyops[5]

Cliffia C. lataegenae[5] C. magnacilis[7] Comanchia C. amplooculata[5] Dellea D. planafrons[7] D. suada[5] Erixanium E. lacunatum[6] Housia H. vacuna[5] Iddingsia I. hapsis[7]

Irvingella I. major[5] Jessievillia J. radiatus[7] Kindbladia K. wichitaensis[5] Kymagnostus K. harti[7] Linnarsonella L. girtyi[5] Neoagnostus N. dilatus[7]

Parabolinoides P. contractus[5] Pseudagnostus P. communis[5] Pseudokingstonia P. exotica[5] Pterocephalia P. sanctisabae[5] Pulchricapitus P. fetosus[7] Pyttstrigis P. dicilia[7] Xenocheilos X. minutum[5]

See also

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

References

1. Purdue, A. (1909). Slates of Arkansas. Geological Survey of Arkansas. pp. 30, 31.
2. Griswold, L.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890. 3.
3. Purdue, A.H. (1909). "Structure and stratigraphy of the Ouachita Ordovician area, Arkansas (abstract)". Geological Society of America Bulletin. 19: 557. doi:10.1130/GSAB-19-513.
4. Repetski, John; Ethington, R. (1977). "Conodonts from graptolite facies in the Ouachita Mountains, Arkansas and Oklahoma". Syposium on the Geology of the Ouachita Mountains. 1: 92–106.
5. Hart, William; Stitt, James; Hohensee, Steven; Ethington, Raymond (May 1987). "Geological implications of Late Cambrian trilobites from the Collier Shale, Jessieville area, Arkansas". Geology. 15 (5): 447–450. doi:10.1130/0091-7613(1987)15<447:giolct>2.0.co;2.
6. Stitt, James; Rucker, John; Boyer, N.; Hart, William (May 1994). "New Elvinia Zone (Upper Cambrian) trilobites from new localities in the Collier Shale, Ouachita Mountains, Arkansas". Journal of Paleontology. 68 (3): 518–523. doi:10.1017/s0022336000025890.
7. Hohensee, Steven; Stitt, James (November 1989). "Redeposited Elvinia Zone (Upper Cambrian) trilobites from the Collier Shale, Ouachita Mountains, west-central Arkansas". Journal of Paleontology. 63 (6): 857–879. doi:10.1017/s0022336000036544.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.