Protaxocrinus annellus Assoc., Willowvale Shale (Silurian of the United States)

Where: New York (43.1° N, 75.3° W: paleocoordinates 26.2° S, 44.6° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Willowvale Shale Formation, Telychian (438.5 - 433.4 Ma)

• "Latest Llandoverian (C6)"

• formation-level stratigraphic resolution

Environment/lithology: offshore; gray, green shale and shelly/skeletal grainstone

• "The occurrence of storm-winnowed coquinites with gutter casts and of rare hummocky laminated siltstones indicates deposition within storm wave base, but in a generally quiet environment. Most fossils disarticulated...Brachiopods mostly convex up, suggesting low sedimentation rates and minor current action...Bathymetric indicators include receptaculitids...as well as storm beds. [Brachiopods suggest BA 4.]"

•2003:04:06 SEP Environmental/tectonic/sequence call based on description and Brett et al. (1998). Bulletin New York State Museum 491:89-143. "Williamson-Willowvale interval has been interpretted as the early (maximum) highstand of Sequence IV" (p.107). Also by Lin and Brett (1988). Stratigraphy and disconformable contacts of the Williamson-Willowvale interval; revised correlations of the late Llandovery (Silurian) in New York State. Northeastern Geology.10(3):241-253.

• "The fossils occur in dark greenish gray shale with some interbedded coquinoid limestones composed of brachiopods and bryozoans."

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 26853: authorized by Michael Foote, entered by Michael Foote on 05.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Chlorophyceae
  - Receptaculitidae
Ischadites planoconvexus
Anthozoa
 Favositida - Favositidae
Favositidae indet.
Favositidae indet. Dana 1846 tabulate coral
 Cystiphyllida - Palaeocyclidae
Palaeocyclus sp.
Palaeocyclus sp. Milne-Edwards and Haime 1849 horn coral
Strophomenata
 Strophomenida - Sowerbyellidae
Eoplectodonta sp.
Eoplectodonta sp. Kozlowski 1929
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
Rhynchonellata
 Pentamerida - Stricklandiidae
Costistricklandia sp.
 Atrypida - Atrypidae
Atrypa sp.
Atrypa sp. Dalman 1828
 Orthida - Rhipidomellidae
Dalejina sp.
Dalejina sp. Havlicek 1953
 Orthida - Dicoelosiidae
Dicoelosia sp.
Dicoelosia sp. King 1850
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
ramose forms
Stenolaemata
 Cryptostomata - Fenestellidae
Fenestellidae indet.
Gastropoda
 Euomphalina - Platyceratidae
Cyclonema sp.
Cyclonema sp. Hall 1852 snail
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
Trilobita
 Phacopida - Calymenidae
Liocalymene sp.
Liocalymene sp. Raymond 1916 trilobite
 Phacopida - Dalmanitidae
Dalmanites sp.
Dalmanites sp. Barrande 1852 trilobite
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
 Monobathrida - Periechocrinidae
? Periechocrinidae indet.
? Periechocrinidae indet. Bronn 1849 Sea lily
holdfast
 Taxocrinida - Taxocrinidae
Protaxocrinus annellus