Clonocrinus-Calliocrinus Community at Thornton Quarry (Silurian to of the United States)

Where: Illinois (41.6° N, 87.6° W: paleocoordinates 25.6° S, 50.8° W)

• coordinate based on political unit

• outcrop-level geographic resolution

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

• formation-level stratigraphic resolution

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

• "Associated fauna...suggestive of BA 3...At the type locality this fauna was collected near the transition between the typical found facies and the dense, cherty intermound beds. A BA 3 position is likely."
• "Moderately fossiliferous flat-bedded to mounded, noncherty to slightly cherty, fine to medium grained skeletal-moldic dolowackestones. Echinoderms preserved as intact thecae or calices lacking arms and stems. Root systems occasionally seen."

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 26703: authorized by Michael Foote, entered by Michael Foote on 24.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Illaenidae
Bumastus sp. Murchison 1839 trilobite
 Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854 trilobite
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
 Strophomenida - Leptostrophiidae
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
 Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
Meristina sp. Hall 1867
 Spiriferida - Cyrtiidae
Eospirifer sp. Schuchert 1913
 Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
 Pentamerida -
Pentamerida indet. Schuchert and Cooper 1931
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828
 Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
 Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Gastropoda indet. Cuvier 1797 snail
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Bryozoa indet. Ehrenberg 1831
branching form
 Rhombifera - Caryocrinitidae
 Sagenocrinida - Lecanocrinidae
 Cyathocrinida - Cyathocrinitidae
Cyathocrinites sp. Miller 1821 Sea lily
 Cyathocrinida - Crotalocrinitidae
Crotalocrinites sp. Austin 1842 Sea lily
 Monobathrida - Carpocrinidae
Carpocrinus sp. Muller 1840 Sea lily
 Monobathrida -
Periechocrinus sp. Morris 1843 Sea lily
Melocrinites sp. Goldfuss 1831 Sea lily
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Monobathrida -
Clonocrinus sp. Quenstedt 1876 Sea lily
Calliocrinus sp. Orbigny 1850 Sea lily
 Monobathrida - Patelliocrinidae
 Glyptosphaeritidacea - Gomphocystitidae
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
 Rugosa -
Rugosa indet. horn coral