Homocrinus-Eucalyptocrinites Assoc., Middle Lewiston Member (Silurian of Canada)

Where: Ontario, Canada (43.0° N, 79.3° W: paleocoordinates 27.0° S, 45.0° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Lewiston Member (Rochester Shale Formation), Wenlock (433.4 - 427.4 Ma)

• C and D submembers of Brett (1983)

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; calcareous mudstone and grainstone

• Some excellent preservation noted. Paleoecology similar to Homocrinus-Asaphocrinus Assoc. (PBDB coll. 28654, relatively deep water (BA 4-5) with occasional storm input.

•2003:04:06 SEP environmental/tectonic/sequence calls based on field knowledge familiarity with stratigraphic context.

• "Occurs sporadically in moderately fossiliferous calcareous mudstones with thin (1-10cm) calcisiltite beds."

Collection methods: Some overlap with collection 12936.

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 26855: authorized by Michael Foote, entered by Michael Foote on 05.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Favositida - Favositidae
Favosites parasiticus tabulate coral
 Stauriida - Streptelasmatidae
Enterolasma sp. Simpson 1900 horn coral
 Hydroida -
Inocaulis sp. Hall 1852
 Homocrinida - Homocrinidae
Homocrinus parvus Hall 1852 Sea lily
 Flexibilia -
 Dendrocrinida - Dendrocrinidae
Dendrocrinus sp. Hall 1852 Sea lily
 Diplobathrida - Dimerocrinitidae
 Monobathrida - Periechocrinidae
 Monobathrida - Patelliocrinidae
 Monobathrida - Eucalyptocrinitidae
  - Hemicystitidae
Hemicystites sp. Hall 1852
  - Pyrgocystidae
? Pyrgocystis sp. Bather 1915
Ophiuroidea indet. Gray 1840 brittle star
 Dendroidea - Dendrograptidae
Dictyonema sp. Hall 1851 graptolite
 Corynexochida - Illaenidae
Bumastus sp. Murchison 1839 trilobite
 Proetida - Proetidae
Proetidae indet. Salter 1864 trilobite
 Phacopida - Dalmanitidae
 Phacopida - Homalonotidae
 Lichida - Lichidae
Arctinurus boltoni Bigsby 1825 trilobite
Bryozoa indet. Ehrenberg 1831
 Strophomenida - Amphistrophiidae
 Strophomenida - Sowerbyellidae
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis Wahlenberg 1818
 Orthotetida - Chilidiopsidae
"Coolinia subplana" = Fardenia (Coolinia)
"Coolinia subplana" = Fardenia (Coolinia)
 Athyridida - Meristellidae
 Orthida - Dalmanellidae
 Rhynchonellida - Rhynchotrematidae
 Atrypida - Atrypidae
Atrypidae indet. Gill 1871
 Spiriferida - Cyrtiidae