Articulate Brachiopods, St. Clair Limestone, Batesville District, Arkansas (Silurian of the United States)

Where: Arkansas (35.8° N, 91.6° W: paleocoordinates 27.5° S, 58.4° W)

• coordinate based on political unit

• local area-level geographic resolution

When: St. Clair Limestone Formation, Wenlock (433.4 - 427.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; shelly/skeletal, gray grainstone and gray lime mudstone

• SEP added from source: "organic debris..(has) been subjected to only moderate breakage and disarticulation before and during deposition, suggesting that it was laid down in a fairly low-energy environment.
• "light gray to pinkish gray, evenly bedded limestone...Basically it is a bioclastic limestone composed in large part of fossil debris cemented with spar or lime mud. The texture ranges from that of a biosparite to that of a biomicrite, and in some beds the two types are intimately associated. Brachiopods are common in both...facies. Most, if not all, of the rock is grain supported, ranging from a grainstone to a packstone..."

Collection methods: Text-fig. 7. Localities 1-12 combined.

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 26022: authorized by Michael Foote, entered by Michael Foote on 01.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Articulate brachiopods only. Mollusks, ostracodes, trilobites and other taxa also present.
Show authors, comments, and common names
unclassified
  -
Diacamaropsis parva
Rhynchonellata
 Pentamerida - Parastrophinidae
Parastrophinella lepida
 Pentamerida - Clorindidae
Antirhynchonella thomasi, Boucotides barrandei
 Rhynchonellida - Trigonirhynchiidae
Ancillotoechia marginata, Virginiata arkansana
 Spiriferida - Delthyrididae
Howellella splendens
 Spiriferida - Cyrtinopsidae
Kozlowskiellina (Kozlowskiellina) vaningeni
 Spiriferida - Cyrtiidae
Eospirifer acutolineatus, Plicocyrtia arkansana
 Atrypida - Lissatrypidae
"Nanospira clairensis" = Lissatrypa
"Nanospira clairensis" = Lissatrypa
 Atrypida - Atrypidae
Atrypa sp.
Atrypa sp. Dalman 1828
 Atrypida - Atrypinidae
Atrypina erugata
Atrypina erugata Amsden 1968
 Atrypida - Septatrypidae
"Hircinisca havliceki" = Septatrypa (Hircinisca)
"Hircinisca havliceki" = Septatrypa (Hircinisca)
 Athyridida - Nucleospiridae
Nucleospira raritas
 Athyridida - Meristellidae
Meristina clairensis
 Athyridida - Rhynchospirinidae
Homoeospirella costatula, Homoeospirella pygmaea
 Orthida - Orthidae
Orthostrophella clairensis
 Orthida - Hesperorthidae
"Dolerorthis" nanella, ? Dolerorthis sp.
? Dolerorthis sp. Schuchert and Cooper 1931
 Orthida - Dicoelosiidae
Dicoelosia bilobella
Dicoelosia bilobella
[entered as Dicoleosia bilobella]
 Orthida - Dalmanellidae
Resserella sp.
Resserella sp. Bancroft 1928
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
 Strophomenida - Shaleriidae
? Shaleria "sp. A", Shaleria "sp. B", Shaleria "sp. C"
? Shaleria "sp. A" Caster 1939
Shaleria "sp. B" Caster 1939
Shaleria "sp. C" Caster 1939
 Strophomenida -
""Cymostrophia" (? Idioglyptus) sp." = Idioglyptus
""Cymostrophia" (? Idioglyptus) sp." = Idioglyptus Northrop 1939
 Strophomenida - Leptestiidae
Leangella (Opikella) dissiticostella
 Strophomenida - Sowerbyellidae
? Plectodonta sp.
? Plectodonta sp. Kozlowski 1929
 Orthotetida - Triplesiidae
Brachymimulus americanus, ? Brachymimulus elongatus, Onychotreta (Onychotreta) multiplicata, Onychotreta (Onychotreta) miseri, Onychotreta (Eilotreta) lenta, Onychotreta (Lissotreta) plicata, Onychotreta (Onychotreta) mesleri, Placotriplesia praecipta, Placotriplesia juvenis, Streptis glomerata
Onychotreta (Onychotreta) mesleri Ulrich and Cooper 1936