Crotalocrinites-Eucalyptocrinites Association of the Gower Formation (Silurian to of the United States)

Also known as Reef 817

Where: Rock Island County County, Illinois (41.5° N, 90.6° W: paleocoordinates 21.9° S, 55.6° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: LeClaire Member (Gower Formation), Silurian to Silurian (443.8 - 427.4 Ma)

• member-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified, graded, dolomitic wackestone

• SEP environmental call based on given description and same vol. page 807.
• Often very fossiliferous. The crinoid-dominated areas are mostly inclined-bedded, vuggy, porous, noncherty, crinoid-moldic dolowackestones, though occasionally dolopackstones-grainstones occur also... Sedimentary textures and fossil occurrences are identical to those seen in Racine mounds, but typically the fauna (e.g., brachiopods, corals, echinoderms) is much less diverse. Local graded bedding, debris wedges, and mound fissures packed with trilobites or nautiloids (forming very local trilobite-moldic and nautiloid-moldic dolowackestones-packstones) are common.

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 13355: authorized by Michael Foote, entered by Kimberly Koverman on 04.03.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Stromotoporoidea indet.
Anthozoa
 Favositida - Favositidae
Favosites sp.
Favosites sp. Lamarck 1816 tabulate coral
 Heliolitida - Halysitidae
? Halysites sp.
? Halysites sp. von Waldheim 1813 tabulate coral
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
 Cystiphyllida - Fletcheriidae
Fletcheria sp.
Fletcheria sp. Milne-Edwards and Haime 1851 horn coral
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
Rhynchonellata
 Rhynchonellida - Rhynchonellidae
Rhynchonellidae indet.
 Spiriferida - Cyrtiidae
Hedeina sp., Eospirifer sp.
Hedeina sp. Boucot 1957
Eospirifer sp. Schuchert 1913
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
 Bellerophontida - Bucaniidae
Tremanotus sp.
Tremanotus sp. Hall 1868 snail
 Murchisoniina - Loxonematidae
Loxonematidae sp.
Loxonematidae sp. Koken 1889 snail
 Murchisoniina -
Murchisonioidea indet.
Murchisonioidea indet. Koken 1896 snail
 Euomphalina - Platyceratidae
Naticonema sp., Cyclonema sp.
Naticonema sp. Perner 1903 snail
Cyclonema sp. Hall 1852 snail
 Euomphalina - Euomphalidae
Euomphalidae sp.
Euomphalidae sp. White 1877 snail
 Euomphalina - Holopeidae
? Pachystrophia sp.
? Pachystrophia sp. Perner 1903 snail
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam
 Myalinida - Ambonychiidae
Amphicoelia sp.
Amphicoelia sp. Hall 1865 clam
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Trilobita
 Corynexochida - Illaenidae
Bumastus sp.
Bumastus sp. Murchison 1839 trilobite
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
 Diplobathrida - Dimerocrinitidae
Dimerocrinites occidentalis, Dimerocrinites sp.
Dimerocrinites sp. Phillips 1839 Sea lily
 Diplobathrida - Lampterocrinidae
Siphonocrinus nobilis
 Monobathrida - Periechocrinidae
Periechocrinus cf. marcouanus, Periechocrinus necis
 Monobathrida - Eucalyptocrinitidae
Calliocrinus cornutus, Eucalyptocrinites cf. ornatus
 Cyathocrinida - Crotalocrinitidae
Crotalocrinites cf. cora
 Flexibilia -
Icthyocrinus subangularis
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites sp.