Articulate Brachiopods, St. Clair Limestone, Batesville District, Arkansas: Wenlock, Arkansas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Diacamaropsis parva
(16 measurements)
Strophomenata - Strophomenida
"Cymostrophia" (? Idioglyptus) sp. (Northrop 1939)
original and current combination Idioglyptus
(3 measurements)
Strophomenata - Strophomenida - Shaleriidae
? Shaleria informal sp. A Caster 1939
(1 measurement)
Shaleria informal sp. B Caster 1939
(1 measurement)
Shaleria informal sp. C Caster 1939
(1 measurement)
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
(3 measurements)
Strophomenata - Strophomenida - Leptestiidae
Leangella (Opikella) dissiticostella
(11 measurements)
Strophomenata - Strophomenida - Sowerbyellidae
? Plectodonta sp. Kozlowski 1929
(2 measurements)
Strophomenata - Orthotetida - Triplesiidae
Onychotreta (Onychotreta) multiplicata
Onychotreta (Onychotreta) miseri
Onychotreta (Eilotreta) lenta
Onychotreta (Lissotreta) plicata
Onychotreta (Onychotreta) mesleri Ulrich and Cooper 1936
Streptis glomerata
(5 measurements)
Placotriplesia praecipta
(3 measurements)
Placotriplesia juvenis
(1 measurement)
Brachymimulus americanus
(4 measurements)
? Brachymimulus elongatus
(1 measurement)
Rhynchonellata - Atrypida - Septatrypidae
Hircinisca havliceki
spelled with current rank as Septatrypa (Hircinisca)
(4 measurements)
Rhynchonellata - Atrypida - Lissatrypidae
Nanospira clairensis
synonym of Lissatrypa
(14 measurements)
Rhynchonellata - Atrypida - Atrypinidae
Atrypina erugata Amsden 1968
(7 measurements)
Rhynchonellata - Atrypida - Atrypidae
Atrypa sp. Dalman 1828
(6 measurements)
Rhynchonellata - Spiriferida - Cyrtiidae
Plicocyrtia arkansana
(6 measurements)
Eospirifer acutolineatus
Rhynchonellata - Spiriferida - Delthyrididae
Howellella splendens
(2 measurements)
Rhynchonellata - Spiriferida - Cyrtinopsidae
Kozlowskiellina (Kozlowskiellina) vaningeni
(1 measurement)
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Ancillotoechia marginata
(5 measurements)
Virginiata arkansana
(5 measurements)
Rhynchonellata - Orthida - Orthidae
Orthostrophella clairensis
Rhynchonellata - Orthida - Hesperorthidae
"Dolerorthis" nanella
(5 measurements)
? Dolerorthis sp. Schuchert and Cooper 1931
(1 measurement)
Rhynchonellata - Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
(5 measurements)
Rhynchonellata - Orthida - Dicoelosiidae
Dicoelosia bilobella
[entered as Dicoleosia bilobella] (5 measurements)
Rhynchonellata - Pentamerida - Parastrophinidae
Parastrophinella lepida
(9 measurements)
Rhynchonellata - Pentamerida - Clorindidae
Antirhynchonella thomasi
(10 measurements)
Boucotides barrandei
(6 measurements)
Rhynchonellata - Athyridida - Nucleospiridae
Nucleospira raritas
(3 measurements)
Rhynchonellata - Athyridida - Meristellidae
Meristina clairensis
(4 measurements)
Rhynchonellata - Athyridida - Rhynchospirinidae
Homoeospirella costatula
(2 measurements)
Homoeospirella pygmaea
(8 measurements)
see common names

Geography
Country:United States State/province:Arkansas
Coordinates: 35.8° North, 91.6° West (view map)
Paleocoordinates:27.5° South, 58.4° West
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period:Silurian Epoch:Wenlock
10 m.y. bin:Silurian 2
Key time interval:Wenlock
Age range of interval:433.40000 - 427.40000 m.y. ago
Stratigraphy
Formation:St. Clair Limestone
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:shelly/skeletal,gray,red or brown grainstone
Secondary lithology:gray lime mudstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "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..."
Environment:deep subtidal ramp Tectonic setting:cratonic basin
Geology comments: 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.
Taphonomy
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Collection method comments: Text-fig. 7. Localities 1-12 combined.
Taxonomic list comments:Articulate brachiopods only. Mollusks, ostracodes, trilobites and other taxa also present.
Metadata
Database number:26022
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-10-01 07:24:02 Last modified:2006-09-15 15:15:11
Access level:the public Released:2002-10-01 07:24:02
Creative Commons license:CC BY
Reference information

Primary reference:
7210. 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]