Articulate Brachiopods, Eospirifer Beds, Fitzhugh Mbr., Clarita Fm., Oklahoma (Silurian of the United States)

Where: Oklahoma (34.3° N, 96.8° W: paleocoordinates 25.6° S, 63.0° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Fitzhugh Member (Clarita Formation), Wenlock (433.4 - 427.4 Ma)

• Eospirifer beds are in the lower part of Fitzhugh Member, but it is not clear from data presented by Amsden whether a Sheinwoodian or Homerian age is more likely.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; shelly/skeletal grainstone and packstone

• Amsden suggests condition of shells indicates low-energy environment, much material possibly in situ. No evidence of reefs or buildups.

•SEP environmental call based on given info and on Amsden (1968) JP 42 sup. to 3

• "...limestone with moderately thin, uniform bedding...Basically it is a bioclastic, grain-supported rock ranging from a grainstone to a packstone. The cementing material may be spar or micrite...commonly pink...crinoidal...[in places approaching a marlstone]..."

Collection methods: Text-fig. 12, Eospirifer beds.

Primary reference: T. W. Amsden. 1968. Articulate brachiopods of the St. Clair Limestone (Silurian), Arkansas and the Clarita Formation (Silurian), Oklahoma. Paleontological Society Memoir 1:1-117 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 26024: authorized by Michael Foote, entered by Michael Foote on 01.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Articulate brachiopods only.
Show authors, comments, and common names
Rhynchonellata
 Pentamerida - Parastrophinidae
Parastrophinella lepida
 Pentamerida - Clorindidae
Antirhynchonella thomasi
 Spiriferida - Delthyrididae
Howellella splendens
 Spiriferida - Cyrtiidae
Eospirifer acutolineatus
 Atrypida - Lissatrypidae
"Nanospira clairensis" = Lissatrypa
"Nanospira clairensis" = Lissatrypa
 Athyridida - Meristidae
Dicamaropsis parva
 Orthida - Orthidae
Orthostrophella clairensis
 Orthida - Hesperorthidae
? Dolerorthis sp.
? Dolerorthis sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida - Shaleriidae
? Shaleria "sp. A"
? Shaleria "sp. A" Caster 1939
 Strophomenida - Leptestiidae
Leangella (Opikella) dissiticostella
 Orthotetida - Triplesiidae
Brachymimulus americanus, Onychotreta (Onychotreta) multiplicata