The Collier Shale is a
geologic formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...
in the
Ouachita Mountains of
Arkansas
Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage ...
and
Oklahoma
Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...
. Dating from the Late
Cambrian
The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million ...
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.
Paleofauna
Conodonts
Conodonts (Greek ''kōnos'', "cone", + ''odont'', "tooth") are an extinct group of agnathan (jawless) vertebrates resembling eels, classified in the class Conodonta. For many years, they were known only from their tooth-like oral elements, which ...
* ''Acanthodus
''Acanthodus'' is an extinct genus of conodonts.
''Acanthodus humachensis'' and ''A. raqueli'' are from then Late Cambrian (late Furongian) or early Ordovician (Tremadocian) of the Santa Rosita Formation
Santa Claus, also known as Father ...
''
: ''A. lineatus''Acodus
''Acodus'' is an extinct genus of conodonts.
Species
* ''A. acutus''
* ''A. campanula''
* ''A. crassus''
* ''A. delicatus''
* ''A. deltatus''
* ''A. erectus''
* ''A. firmus''
* ''A. jonesi''
* ''A. kechikaensis''
* ''A. neodeltatus''
* ''A. ...
''
: ''A. oneotensis''[
* '' Chosonodina''
: ''C. herfurthi''][
* '' Cordylodus''
: ''C. angulatus''][
* '' Loxodus''
: ''L. bransoni''][
* '' Oistodus''
: ''O. triangularis''][
* '' Paltodus''
: ''P. bassleri''][
* '' Phakelodus''
: ''P. tenuis''][
]
Trilobites
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...
* '' Anechocephalus''
: ''A. aphelodermus''[
* '' 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
''Kymagnostus'' is a genus of trilobite in the order Agnostida, which existed in what is now Arkansas, United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country ...
''
: ''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
This article contains a list of fossil-bearing stratigraphic units in the state of Arkansas, U.S.
Sites
See also
* Paleontology in Arkansas
References
*
{{DEFAULTSORT:Fossiliferous stratigraphic units in Arkansas
Arkansas
Stratigraphi ...
* Paleontology in Arkansas
Paleontology in Arkansas refers to paleontological research occurring within or conducted by people from the United States, U.S. state of Arkansas. The fossil Fossil record, record of Arkansas spans from the Ordovician to the Eocene. Nearly all of ...
References
*
Cambrian Arkansas
Cambrian southern paleotropical deposits
Ordovician Arkansas
Ordovician geology of Oklahoma
{{Cambrian-stub