USNM 438c. Searcy Spring: Wenlock, Arkansas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Proetida - Brachymetopidae
Radnoria sp. Wasmann 1894
Trilobita - Proetida - Aulacopleuridae
Harpidella spinulocervix
Trilobita - Proetida - Tropidocoryphidae
Dipharangus xeo
Decoroproetus informal sp. 1 Pribyl 1946
Decoroproetus corycoeus (Conrad 1842)
Trilobita - Proetida - Proetidae
Cornuproetus kyphora Holloway 1980
Pseudogerastos vaningeni (Foerste 1923)
Trilobita - Corynexochida - Styginidae
Illaenoides elongata Thomas 1929
? Ciliscutellum informal sp. Lin 1987
Scutelluidae informal pygidium indet. 2
invalid subgroup of Styginidae
Kosovopeltis informal sp. 1 Snajdr 1958
? Kosovopeltis informal sp. 2 Snajdr 1958
? Octobronteus incertus
? Octobronteus ormistoni
Liolalax clairensis
Liolalax informal sp. A Holloway and Lane 1999
Trilobita - Corynexochida - Illaenidae
Bumastus cf. danielsi
Bumastus barriensis (Murchison 1839)
recombined as Parillaenus roemeri
Trilobita - Odontopleurida - Odontopleuridae
? Kettneraspis arkansana (Van Ingen 1901)
? Diacanthaspis (Diacanthaspis) tricosa
Dalaspis obsoleta (Van Ingen 1901)
Miraspis informal sp. A Richter and Richter 1917
Ceratocephala depauperata Van Ingen 1901
Selenopeltoides nodulatus (Van Ingen 1901)
Trilobita - Lichida - Lichidae
Trochurus (Trochurus) depauperatus
Trochurus (Atyzela) searcyensis
Dicranopeltis kallaion
Dicranopeltis eretes Holloway 2021
Dicranopeltis arkansana (Van Ingen 1901)
Arctinurus clairensis Thomas 1929
Trilobita - Phacopida - Calymenidae
Diacalymene altirostris
Sthenarocalymene scutula Holloway 1980
recombined as Gravicalymene scutula
Trilobita - Phacopida - Encrinuridae
Balizoma sp. Holloway 1980
Staurocephalus lagena
Staurocephalus aff. lagena
Staurocephalus oarion
Encrinurus egani
Trilobita - Phacopida - Cheiruridae
Sphaerexochus glaber Holloway 1980
Deiphon longifrons
Trilobita - Phacopida - Phacopidae
Ananaspis sp. Campbell 1967
Eophacops fontana
Trilobita - Phacopida - Dalmanitidae
Dalmanites howelli
Dalmanites ptyktorion
Dalmanites informal sp. 1 Barrande 1852
Dalmanites informal sp. 3 Barrande 1852
Ommokris bassleri
synonym of Dalmanites
Delops collatus
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
Lithology description: "consists predominantly of grey to pink or red pelmatozoan biosparite and grey biomicrite and at certain horizons contains abundant trilobites, brachiopods, mollusks, and ostracodes"
Environment:deep subtidal ramp Tectonic setting:cratonic basin
Geology comments: SEP environmental call based on scanty given info. and ref (see 26022)
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Metadata
Database number:229058
Authorizer:P. Wagner Enterer:P. Wagner
Research group:marine invertebrate
Created:2023-02-04 21:02:10 Last modified:2023-02-04 21:02:10
Access level:the public Released:2023-02-04 21:02:10
Creative Commons license:CC BY
Reference information

Primary reference:
83789. D. J. Holloway. 2021. Middle Silurian trilobites from Arkansas and Oklahoma, USA. Orders Lichida and Odontopleurida. Palaeontographica Abteilung A 319(1-6):57-131 [P. Wagner/P. Wagner]