Homocrinus-Asaphocrinus Assoc., Rochester Shale, Lockport (Silurian of the United States)

Also known as Striispirifer-Amphistrophia Community

Where: New York (43.2° N, 78.7° W)

• Paleocoordinates: 27.8° S, 81.2° W (Wright 2013)

• coordinate based on political unit

• local area-level geographic resolution

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

• formation-level stratigraphic resolution

Environment/lithology: offshore; gray, calcareous mudstone and gray, calcareous shale

• Echinoderms well preserved, in thin layers, articulated, suggesting frequent burial by mud layers with little disturbance; shallow (storm effects) but below zone of direct storm impingement. BA 4-5.

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

• "dark gray, calcareous mudstones and shales"

Collection methods: Much overlap with collection 12936, but not strictly speaking a subset (for example, trilobites are listed here but not in that collection). Authors say this community is a subset of the Striispirifer-Amphistrophia Community, which is represented by collection 12936. I have included taxa from table 45.50 (listed there with abundances) as well as a few other taxa mentioned in text but not listed for the one locality in table.

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 26854: authorized by Michael Foote, entered by Michael Foote on 05.11.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

unclassified
  -
Saccocrinus sp., "Metazoa indet." = Animalia, "? Metazoa indet." = Animalia, Porifera indet.
"Metazoa indet." = Animalia Linnaeus 1758
trace fossils (feeding burrow)
"? Metazoa indet." = Animalia Linnaeus 1758
undetermined encruster
Porifera indet. Grant 1836
Anthozoa
 Favositida - Favositidae
Favosites parasiticus tabulate coral
Trilobita
  -
Trilobita indet. Walch 1771 trilobite
 Lichida - Lichidae
Arctinurus boltoni Bigsby 1825 trilobite
 Proetida - Proetidae
"Proetus ? stokesi" = Warburgella stokesii
"Proetus ? stokesi" = Warburgella stokesii Murchison 1839 trilobite
 Corynexochida - Illaenidae
Bumastus ioxus Hall 1868 trilobite
 Phacopida - Calymenidae
Calymene niagarensis Hall 1843 trilobite
 Phacopida - Homalonotidae
 Phacopida - Dalmanitidae
Ostracoda
  -
"Paraechmina spinosa" = Cytherina spinosa
"Paraechmina spinosa" = Cytherina spinosa Hall 1852 ostracod
Stenolaemata
 Cryptostomata - Rhinoporidae
 Cryptostomata - Fenestellidae
Fenestella sp. Lonsdale 1839
 Trepostomata - Trematoporidae
 Cystoporata - Fistuliporidae
  - Phylloporinidae
Craniata
 Craniopsida - Craniopsidae
"Pholidops squamiformis" = Craniops
"Pholidops squamiformis" = Craniops
Rhynchonellata
 Spiriferida - Cyrtiidae
 Rhynchonellida - Rhynchotrematidae
 Athyridida - Rhynchospirinidae
 Athyridida - Meristellidae
 Orthida - Rhipidomellidae
Dalejina "hybrida" Sowerby 1839
 Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
 Atrypida - Atrypinidae
 Atrypida - Atrypidae
Atrypa "reticularis" Linnaeus 1758
Strophomenata
 Strophomenida - Amphistrophiidae
 Strophomenida - Rafinesquinidae
Leptaena "rhomboidalis" Wahlenberg 1818
 Strophomenida - Sowerbyellidae
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis Wahlenberg 1818
 Orthotetida - Chilidiopsidae
"Coolinia subplana" = Fardenia (Coolinia)
"Coolinia subplana" = Fardenia (Coolinia)
Lophophorata
 Tentaculitida - Cornulitidae
Cornulites sp. Schlotheim 1820
Bivalvia
 Ostreida - Pterineidae
Gastropoda
 Euomphalina - Platyceratidae
"Naticonema niagarensis" = Platyostoma niagarensis
"Naticonema niagarensis" = Platyostoma niagarensis Hall 1852 snail
Pterobranchia
 Dendroidea - Acanthograptidae
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Crinoidea
 Monobathrida - Patelliocrinidae
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Diplobathrida - Rhodocrinitidae
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp. Phillips 1839 Sea lily
 Flexibilia -
 Sagenocrinida - Homalocrinidae
 Dendrocrinida - Dendrocrinidae
Dendrocrinus sp. Hall 1852 Sea lily
 Myelodactylida - Myelodactylidae
Crinobrachiatus sp. Moore 1962 Sea lily
 Homocrinida - Homocrinidae
Homocrinus parvus Hall 1852 Sea lily
Ophiuroidea
 Oegophiurida - Protasteridae
Protaster stellifer Ringueberg 1886 brittle star
Asteroidea
 Hadrosida - Palaeasteridae
Palaeaster niagarensis Hall 1852 sea star
Edrioasteroidea
  - Hemicystitidae