Lampterocrinus inflatus Community, Racine and Waukesha Formations (Silurian to of the United States)

Where: Wisconsin (43.0° N, 88.0° W: paleocoordinates 24.3° S, 50.1° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Wenlock to Wenlock (433.4 - 423.0 Ma)

• Racine and Waukesha Formations in Wisconsin, Racine and ?Joliet Formations in Illinois.

Environment/lithology: sand shoal; dolomitic, pyritic, shelly/skeletal, cherty/siliceous wackestone and dolomitic, pyritic, shelly/skeletal, cherty/siliceous packstone

• "The community appears to have been subject to storm wvaes, but not constant currents. This BA 3 comm. is one of the more common Racine high dominance echinoderm thicket communities..often in association with other...mound associated communities"
• "Abundantly fossiliferous, with echinoderms (esp. camerate crinoids) overwhelmingly dominant both as whole fossils and as skeletal debris. All echinoderms are isolated calices or thecae that do not preserve the feeding appendages or stems. Pelmatozoan root systems occur sporadically throughout, sometimes forming locally dense aggregations on particular bedding surfaces. The lithology is inclined-bedded, porous to very porous, generally low-chert, low pyrite, echinoderm moldic to echinoderm-replaced dolowackestone to packstone, with rare grainstone noted also. The non-echinoderms are often articulated...Debris is generally in large pieces (0.3 mm), with plates whole and unabraded..."

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 26707: 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
unclassified
  -
Periechorinus sp.
Crinoidea
 Sagenocrinida - Lecanocrinidae
Lecanocrinus sp.
 Cyathocrinida - Crotalocrinitidae
Crotalocrinites sp.
Crotalocrinites sp. Austin 1842 Sea lily
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp.
Dimerocrinites sp. Phillips 1839 Sea lily
 Diplobathrida - Lampterocrinidae
Lampterocrinus inflatus, Siphonocrinus nobilus
 Monobathrida - Marsupiocrinidae
Marsupiocrinus sp.
Marsupiocrinus sp. Morris 1843 Sea lily
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites spp.
Eucalyptocrinites spp. Goldfuss 1831 Sea lily
 Glyptosphaeritida - Gomphocystitidae
Gomphocystites sp.
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites sp.
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Rhynchonellata
 Spiriferida - Cyrtiidae
Hedeina sp.
Hedeina sp. Boucot 1957
 Pentamerida - Pentameridae
"? Apopentamerus sp." = Harpidium (Isovella)
"? Apopentamerus sp." = Harpidium (Isovella) Breyvel and Breyvel 1970
 Rhynchonellida -
Rhynchonellida indet.
Strophomenata
 Strophomenida - Leptostrophiidae
Protomegastrophia sp.