Also known as section SB-R; Rochdale Fm., "Fort Ann Fm."; east of Smiths Basin, Washington Co.

Where: Washington County, New York (43.4° N, 73.5° W: paleocoordinates 31.9° S, 67.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Rochdale Formation (Beekmantown Group), Stairsian (485.4 - 478.6 Ma)

• "As concluded by Landing & Westrop (2006, p. 967), the Rochdale Formation is the senior synonym of the ‘Fort Ann Formation’, a unit for which a type section was never specified and which was named for a village that is actually located on Late Ordovician synorogenic flysch. Further north in western Vermont, the Bascom Formation (Cady, 1945) includes three divisions that indicate lateral equivalency and junior synonymy with the upper Tribes Hill, Rochdale and Fort Cassin formations (Landing, Westrop & Van Aller Hernick, 2003)." (Kröger & Landing, 2008 p. 492)

• member-level stratigraphic resolution

Environment/lithology: shallow subtidal; stromatolitic, shelly/skeletal reef rocks and dolomite

Size class: macrofossils

Preservation: cast

Collected by R. H. Flower; reposited in the NYSM

• "The bulk of the material collected by R. H. Flower from the Rochdale Formation in the 1940s came from the Smith Basin section, and is reposited under NYSM Paleontology Collection locality number 5897 (146 specimens). An examination of the currently exposed parts of the Smith Basin succession indicates that Flower’s cephalopods did not come from the lower part of the sequence, and the lithology is more suggestive of the top." (Kröger & Landing, 2008 p. 494).

•"Most of the cephalopods discussed herein were collected in the 1940s by R. H. Flower during his tenure at the New York State Museum (NYSM). Flower (1955, 1956, 1964a, 1976) repeatedly referred to this material in the NYSM Paleontology Collection [...]" (ibid. p. 491).

Primary reference: B. Kröger and E. Landing. 2008. Onset of the Ordovician cephalopod radiation - evidence from the Rochdale Formation (middle Early Ordovician, Stairsian)in eastern New York. Geological Magazine 145(4):490-520 [B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89491: authorized by Björn Kröger, entered by Torsten Liebrecht on 26.05.2009

Creative Commons license: CC BY (attribution)