Dimerocrinites (D.) pentangularis Assoc., Racine Formation (Silurian to of the United States)

Where: Iowa (42.0° N, 88.0° W: paleocoordinates 25.1° S, 50.8° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Racine Formation, Wenlock to Wenlock (433.4 - 423.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: open shallow subtidal; dolomitic, shelly/skeletal wackestone and dolomitic, shelly/skeletal packstone

• "Echinoderms preserved as large debris and intact calices...occasional root systems..The Community often borders high-dominance, mound-related camerate communities, but contains a significantly higher non-echinoderm component...mostly as articulated specimens. A BA 3 position, rather than the more offshore position of the Welton member equivalent (which is not mound-related), seems likely from the associated fauna."

•SEP environmental call based on given information and regional context

• "The basic lithology is horizontal to inclined bedded, noncherty, porous, skeletal-moldic (dominantly crioind-moldic) dolowackestone to dolopackstone."

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26716: authorized by Michael Foote, entered by Michael Foote on 25.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Crinoidea
 Diplobathrida - Dimerocrinitidae
Dimerocrinites (Dimerocrinites) pentangularis
 Diplobathrida - Rhodocrinitidae
Lyriocrinus sp.
Lyriocrinus sp. Hall 1852 Sea lily
 Monobathrida - Melocrinitidae
Melocrinites sp.
Melocrinites sp. Goldfuss 1831 Sea lily
 Monobathrida - Eucalyptocrinitidae
Calliocrinus sp., Eucalyptocrinites sp.
Calliocrinus sp. Orbigny 1850 Sea lily
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Cyathocrinida - Crotalocrinitidae
Crotalocrinites sp.
Crotalocrinites sp. Austin 1842 Sea lily
 Flexibilia -
Icthyocrinus sp.
Icthyocrinus sp. Conrad 1842 Sea lily
 Sagenocrinida - Lecanocrinidae
Lecanocrinus sp.
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites sp.
unclassified
  -
Mollusca indet.
Mollusca indet. Linnaeus 1758
Rhynchonellata
 Pentamerida - Parastrophinidae
Anastrophia sp.
Anastrophia sp. Hall 1867
 Pentamerida - Pentameridae
Kirkidium sp., Pentameroides sp., Harpidium sp.
Kirkidium sp. Amsden et al. 1967
Pentameroides sp. Schuchert and Cooper 1931
Harpidium sp. Kirk 1925
 Rhynchonellida -
Rhynchonellida indet.
 Rhynchonellida - Machaerariidae
Ferganella sp.
Ferganella sp. Nikiforova 1937
 Spiriferida - Delthyrididae
Howellella sp.
Howellella sp. Kozlowski 1946
 Spiriferida - Cyrtiidae
Hedeina sp., Eospirifer sp.
Hedeina sp. Boucot 1957
Eospirifer sp. Schuchert 1913
 Atrypida - Atrypidae
Atrypa sp.
Atrypa sp. Dalman 1828
 Athyridida - Meristellidae
Whitfieldella sp.
Whitfieldella sp. Hall and Clarke 1893
 Athyridida - Rhynchospirinidae
Homoeospira sp.
Homoeospira sp. Hall and Clarke 1893
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
Strophomenata
 Strophomenida - Leptostrophiidae
Protomegastrophia sp.
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
Anthozoa
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
 Tabulata -
Tabulata indet.
Tabulata indet. tabulate coral