Amphistrophia-Dalmanites Subcommunity of the middle beds of the Rochester Shale (Silurian of the United States)

Where: New York (43.2° N, 77.6° W: paleocoordinates 27.4° S, 43.7° W)

• coordinate based on political unit

• local area-level geographic resolution

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

• Middle Rochester Shale (Lewiston Member, Submembers C and D)

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified shale

• Low to moderate sedimentation rates and a general lack of episodic burial horizons (mud tempestites), unlike other Rochester Shale assemblages. These features are consistent with a relatively low, but not bysaerobic oxygen level, and/or high turbidity environment protected from storms.
• dark shale

Primary reference: C. E. Brett. 1999. Wenlockian fossil communities in New York State and adjacent areas: Paleontology and Paleoecology. In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities: A Case Study from the Silurian and Lower Devonian 592-637 [M. Foote/K. Koverman/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 12934: authorized by Michael Foote, entered by Kimberly Koverman on 11.01.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Illaenidae
Bumastus sp. Murchison 1839 trilobite
 Phacopida - Dalmanitidae
 Phacopida - Homalonotidae
 Phacopida - Calymenidae
Calymene sp. Brongniart 1822 trilobite
 Orthotetida - Chilidiopsidae
"Coolinia subplana" = Fardenia (Coolinia)
"Coolinia subplana" = Fardenia (Coolinia)
 Strophomenida - Sowerbyellidae
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis Wahlenberg 1818
 Strophomenida - Rafinesquinidae
Leptaena ? rhomboidalis Wahlenberg 1818
Leptaena 'rhomboidalis'
 Strophomenida - Amphistrophiidae
 Dictyonellida - Eichwaldiidae
"Dictyonella corallifera" = Eodictyonella
"Dictyonella corallifera" = Eodictyonella
 Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
 Spiriferida - Cyrtiidae
Eospirifer radiatus Sowerby 1834
 Atrypida - Atrypidae
Atrypa ? reticularis Linnaeus 1758
Atrypa 'reticularis'
 Rhynchonellida - Trigonirhynchiidae
 Rhynchonellida - Rhynchotrematidae
 Orthida - Rhipidomellidae
Dalejina hybrida Sowerby 1839
 Orthida - Dalmanellidae
 Lingulida - Lingulidae
Lingula sp. BruguiƩre 1797
 Craniopsida - Craniopsidae
Bivalvia indet. Linnaeus 1758 clam
 Ostreida - Pterineidae
 Euomphalina - Platyceratidae
Platyceras sp., "Naticonema niagarensis" = Platyostoma niagarensis
Platyceras sp. Conrad 1840 snail
"Naticonema niagarensis" = Platyostoma niagarensis Hall 1852 snail
 Orthocerida - Kionoceratidae
Kionoceras sp. Hyatt 1884
 Orthocerida - Dawsonoceratidae
Dawsonoceras sp. Hyatt 1884
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
 Cryptostomata - Rhinoporidae
 Tuboidea -
 Dendrocrinida - Dendrocrinidae
Dendrocrinus sp. Hall 1852 Sea lily
 Stauriida - Streptelasmatidae