Arnheim (Ordovician of the United States)

Where: Tennessee (35.5° N, 86.5° W: paleocoordinates 27.9° S, 64.2° W)

• basin-level geographic resolution

When: Arnheim Formation, Maysvillian (452.0 - 449.5 Ma)

• Maysvillian; Collection may include some of overlying Sequatchie Tongue

• formation-level stratigraphic resolution

Environment/lithology: lithified, shelly/skeletal packstone and mudstone

• Geological information from field notes of S.M. Holland and M.E. Patzkowsky
• primarily thin to very thin bedded skeletal packstones, interbedded with very thin gray mudstones

Size classes: macrofossils, mesofossils

Preservation: original calcite

Primary reference: C. W. Wilson. 1949. Pre-Chattanooga stratigraphy in Central Tennessee. Tennessee Division of Geology Bulletin 56:1-415 [S. Holland/S. Holland]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5390: authorized by Steven Holland, entered by Steven Holland on 29.09.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Wilson reports faunal list of Bassler (1932), which may include some fauna from the overlying Sequatchie
unclassified
  -
Demospongiae
 Streptosclerophorida - Hindiidae
Hindia sphaeroidalis Duncan 1879 demosponge
 Sigmatosclerophorida - Dystactospongiidae
Dystactospongia sp. Miller 1882 demosponge
Anthozoa
 Stauriida - Streptelasmatidae
"Streptelasma rusticum" = Helicelasma rusticum
"Streptelasma rusticum" = Helicelasma rusticum Billings 1858 horn coral
 Stauriida - Columnariidae
Columnaria alveolata Goldfuss 1826 horn coral
Gastropoda
 Murchisoniina - Lophospiridae
"Lophospira bowdeni" = Paupospira bowdeni
"Lophospira bowdeni" = Paupospira bowdeni Safford 1869 snail
 Euomphalina - Platyceratidae
Cyclonema fluctuatum James 1871 snail
Strophomenata
 Strophomenida - Plectambonitidae
 Strophomenida - Rafinesquinidae
Leptaena richmondensis Foerste 1909
Leptaena richmondensis precursor
 Strophomenida - Strophomenidae
"Strophomena subtenta" = Strophomena vetusta James 1874
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema dentatum, "Rhynchotrema capax" = Hiscobeccus capax
Rhynchotrema dentatum Hall 1847
Rhynchotrema dentatum arnheimensis
"Rhynchotrema capax" = Hiscobeccus capax Conrad 1842
 Orthida - Plaesiomyidae
"Dinorthis subquadrata" = Plaesiomys subquadratus, Dinorthis carleyi
"Dinorthis subquadrata" = Plaesiomys subquadratus Hall 1847
Dinorthis carleyi Hall 1860
 Orthida - Glyptorthidae
"Hebertella insculpta" = Glyptorthis insculpta
"Hebertella insculpta" = Glyptorthis insculpta Hall 1847
 Orthida - Plectorthidae
 Orthida - Platystrophiidae
Platystrophia ponderosa Foerste 1909
Platystrophia ponderosa auburnensis
Platystrophia cypha James 1874
P.cypha, P.c.conradi, P.c.arcta, P.c.tumida
 Orthida - Dalmanellidae
Stenolaemata
 Trepostomida - Amplexoporidae
Rhombotrypa quadrata Rominger 1866