Dendrocrinus-Dimerocrinites Assoc., Upper Rochester Shale, Thorold, Ont. (Silurian of Canada)

Where: Ontario, Canada (43.1° N, 79.2° W: paleocoordinates 26.9° S, 44.9° W)

• coordinate based on political unit

• local area-level geographic resolution

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

• Upper Rochester Shale, uppermost Burleigh Hill Member, transitional into DeCew Dolostone.

• member-level stratigraphic resolution

Environment/lithology: offshore; gray, silty, calcareous mudstone and grainstone

• Excellent preservatio nof crinoids. Some assemblages in lenses that are interpreted as scour channel fillings. "relatively shallow, below wave base, muddy to silty sea floors that experienced episodic disturbance by storm-generated currents...BA 3-4 position is likely"

•

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

• "Associated lithologies are either sparsely fossiliferous, calcareous, medium gray silty mudstone or laminated to cross-laminated calcisiltite."

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 26687: authorized by Michael Foote, entered by Michael Foote on 24.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Periechiocrinus sp.
Trilobita
 Phacopida - Homalonotidae
Trimerus delphinocephalus
 Phacopida - Dalmanitidae
Dalmanites limulurus
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
Stegerhynchus sp.
Stegerhynchus sp. Foerste 1909
Strophomenata
 Strophomenida - Amphistrophiidae
Amphistrophia sp.
Amphistrophia sp. Hall and Clarke 1892
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
Bivalvia
 Ostreida - Pterineidae
Cornellites sp.
Cornellites sp. Williams 1908 oyster
Crinoidea
 Dendrocrinida - Dendrocrinidae
Dendrocrinus spp.
Dendrocrinus spp. Hall 1852 Sea lily
2 species
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp.
Dimerocrinites sp. Phillips 1839 Sea lily
 Monobathrida - Melocrinitidae
Alisocrinus sp.
Alisocrinus sp. Kirk 1929 Sea lily