Monograptid-Strophochonetes Community at the lower meter of the Williamson Shale (Silurian to of the United States)

Where: New York (43.2° N, 77.2° W: paleocoordinates 25.8° S, 45.5° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Pterospathodus amorphognathoides zone, Williamson Shale Formation (Clinton Group), Llandovery to Llandovery (443.4 - 427.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified, bioturbated, black shale

• 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 dark greenish to nearly black coloration, fissile, sparsely bioturbated nature of the clay shales and, at some localities, an abundance of pyrite...

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 12929: authorized by Michael Foote, entered by Kimberly Koverman on 10.01.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Dendroidea - Acanthograptidae
? Dictyonema sp.
? Dictyonema sp. Hall 1851 graptolite
 Graptoloidea - Retiolitidae
Retiolites geinitzianus
Retiolites geinitzianus Barrande 1850 graptolite
R. geinitzianus venosus
 Graptoloidea - Monograptidae
Monograptus clintonensis
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites sp.
Tentaculites sp. von Schlotheim 1820
Rhynchonellata
 Spiriferida - Cyrtiidae
Eospirifer radiatus
Eospirifer radiatus Sowerby 1834
 Athyridida - Meristellidae
"? Whitfieldia sp." = Meristella (Whitfieldia)
"? Whitfieldia sp." = Meristella (Whitfieldia) Davidson 1881
 Atrypida - Atrypinidae
Atrypina disparilis
 Atrypida - Atrypidae
Atrypa ? reticularis
Atrypa ? reticularis Linnaeus 1758
Atrypa 'reticularis'
 Orthida - Dicoelosiidae
Dicoelosia biloba
Dicoelosia biloba Linnaeus 1758
 Protorthida - Skenidiidae
Skenidioides pyramidalis
Skenidioides pyramidalis Twenhofel 1928
 Pentamerida - Clorindidae
Clorinda fornicata
Strophomenata
 Strophomenida -
Strophochonetes cornutus
 Strophomenida - Sowerbyellidae
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis
"Eoplectodonta transversalis" = Eoplectodonta (Eoplectodonta) transversalis Wahlenberg 1818
 Strophomenida - Rafinesquinidae
Leptaena ? rhomboidalis
Leptaena ? rhomboidalis Wahlenberg 1818
Leptaena 'rhomboidalis"
 Orthotetida - Chilidiopsidae
"Coolinia subplana" = Fardenia (Coolinia)
"Coolinia subplana" = Fardenia (Coolinia)
Craniata
 Craniopsida - Craniopsidae
Craniops linguiformis
Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma sulcatum
Ostracoda
 Palaeocopida - Beyrichiidae
Dibolbina sp., ? Beyrichia aff. lakemontensis
Dibolbina sp. Ulrich and Bassler 1923 ostracod
? Beyrichia aff. lakemontensis ostracod
'Beyrichia' aff. lakemontensis
 Beyrichiacea - Zygobolbidae
Mastigobolbina punctata, Mastigobolbina trilobatus, Mastigobolbina typus