Thorpe Point Section-- Fort Cassin Fm. (Ordovician of the United States)

Where: Vermont (44.5° N, 73.3° W: paleocoordinates 30.2° S, 60.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Fort Cassin Formation, Arenig (478.6 - 466.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, shelly/skeletal lime mudstone and lithified, intraclastic, shelly/skeletal grainstone

• Deposited in subtidal shelf setting between normal and storm wave bases.

Size class: macrofossils

Reposited in the AMNH, CM, MCZ, NYSM

Collection methods: bulk,

Primary reference: K. D. Brett and S. R. Westrop. 1996. Trilobites of the Lower Ordovician (Ibexian) For Cassin Formation, Champlain Valley Region, New York State and Vermont. Journal of Paleontology 70(3):408-427 [S. Peters/S. Peters/O. Alfaro]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 55241: authorized by Shanan Peters, entered by Shanan Peters on 30.09.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Proetida - Bathyuridae
Acidiphorus whittingtoni, "Grinnellaspis cf. marginiata" = Uromystrum marginiatus
Acidiphorus whittingtoni Brett and Westrop 1996 trilobite
"Grinnellaspis cf. marginiata" = Uromystrum marginiatus Billings 1865 trilobite
 Asaphida - Asaphidae
Isoteloides canalis, Isoteloides peri
Isoteloides canalis Whitfield 1886 trilobite
Isoteloides peri Fortey 1979 trilobite