Homocrinus-Eucalyptocrinites Assoc., Middle Lewiston Member: Wenlock, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Orthida - Dalmanellidae
Rhynchonellata - Atrypida - Atrypidae
Rhynchonellata - Athyridida - Meristellidae
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Rhynchonellata - Spiriferida - Cyrtiidae
Strophomenata - Orthotetida - Chilidiopsidae
Strophomenata - Strophomenida - Sowerbyellidae
Eoplectodonta transversalis (Wahlenberg 1818)
Strophomenata - Strophomenida - Amphistrophiidae
unclassified
Bryozoa indet. Ehrenberg 1831
ramose
Trilobita - Phacopida - Homalonotidae
Trilobita - Phacopida - Dalmanitidae
Trilobita - Corynexochida - Illaenidae
Bumastus sp. Murchison 1839
Trilobita - Proetida - Proetidae
Proetidae indet. Salter 1864
Trilobita - Lichida - Lichidae
Pterobranchia - Dendroidea - Acanthograptidae
Dictyonema sp. Hall 1851
Ophiuroidea
Crinoidea - Diplobathrida - Dimerocrinitidae
Crinoidea - Monobathrida - Patelliocrinidae
Crinoidea - Monobathrida - Periechocrinidae
Crinoidea - Monobathrida - Eucalyptocrinitidae
Crinoidea - Homocrinida - Homocrinidae
Crinoidea - Dendrocrinida - Dendrocrinidae
Crinoidea
Edrioasteroidea - Hemicystitidae
Edrioasteroidea - Pyrgocystidae
? Pyrgocystis sp. Bather 1915
Hydrozoa - Hydroida
Inocaulis sp. Hall 1852
Anthozoa - Favositida - Favositidae
Anthozoa - Stauriida - Streptelasmatidae
Enterolasma sp. Simpson 1900
see common names

Geography
Country:Canada State/province:Ontario
Coordinates: 43.0° North, 79.3° West (view map)
Paleocoordinates:27.9° South, 81.7° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period: Silurian Epoch: Wenlock
10 m.y. bin: Silurian 2
*Epoch:Middle Wenlock
Key time interval: Wenlock
Age range of interval: 432.9 - 426.7 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Rochester Shale Member:Lewiston
Stratigraphic resolution:group of beds
Stratigraphy comments: C and D submembers of Brett (1983)
Lithology and environment
Primary lithology: calcareous mudstone
Secondary lithology: grainstone
Includes fossils?Y
Lithology description: "Occurs sporadically in moderately fossiliferous calcareous mudstones with thin (1-10cm) calcisiltite beds."
Environment:offshore Tectonic setting:foreland basin
Glacial or sequence phase:highstand systems tract
Geology comments: 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.
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: Some overlap with collection 12936.
Metadata
Database number:26855
Authorizer:M. Foote Enterer:M. Foote
Modifier:S. Peters Research group:marine invertebrate
Created:2002-11-05 14:58:49 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-11-05 14:58:49
Creative Commons license:CC0
Reference information

Primary reference:
4379. 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]