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, this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas. 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.
Paleofauna Conodonts
Acanthodus A. lineatus Acodus A. oneotensis Chosonodina C. herfurthi Cordylodus C. angulatus Drepanodus D. subarcuatus
Loxodus L. bransoni Oistodus O. triangularis Paltodus P. bassleri Phakelodus P. tenuis
Trilobites
Anechocephalus A. aphelodermus Apachia A. genaitholix Aphelotoxon A. lumaleasa Buttsia B. drabensis Cernuolimbus C. monilis Cheilocephalus C. brachyops
Cliffia C. lataegenae C. magnacilis Comanchia C. amplooculata Dellea D. planafrons D. suada Erixanium E. lacunatum Housia H. vacuna Iddingsia I. hapsis
Irvingella I. major Jessievillia J. radiatus Kindbladia K. wichitaensis Kymagnostus K. harti Linnarsonella L. girtyi Neoagnostus N. dilatus
Parabolinoides P. contractus Pseudagnostus P. communis Pseudokingstonia P. exotica Pterocephalia P. sanctisabae Pulchricapitus P. fetosus Pyttstrigis P. dicilia Xenocheilos X. minutum
See also
List of fossiliferous stratigraphic units in Arkansas Paleontology in Arkansas
References