Where: Clinton County, New York (44.9° N, 73.4° W: paleocoordinates 26.7° S, 51.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Amsterdam limestone Formation (Black River Group), Mohawkian (457.5 - 452.5 Ma)

• "Amsterdam limestone" (Flower, 1952 p. 30); The Amsterdam ls. is referred either to the lower part of the Trenton or to the upper part of the Black River Gp. (see fig. 2 in Hewitt & Hall (eds.) 1965, Guide Book and Filed Trips, 37th Annual Meeting of the New York State Geological Association). Both groups are said to be Upper Ordovician in age by Landing & Westrop (2006, J. Paleont. 80(5)) whereas the Amsterdam ls. is said to be Middle Ordovician in the GEOLEX database of the USGS (http://ngmdb.usgs.gov/Geolex/NewUnits/unit_98.html).

• bed-level stratigraphic resolution

Environment/lithology: limestone

Size class: macrofossils

Preservation: replaced with calcite

Reposited in the NYSM

Primary reference: R. H. Flower. 1952. New Ordovician Cephalopods from Eastern North America. Journal of Paleontology 26(1):24-59 [B. Kröger/T. Liebrecht] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89010: authorized by Björn Kröger, entered by Torsten Liebrecht on 28.04.2009