Also known as cephalopod localities D and F of Dwight (1884); Rochdale Fm., "Fort Ann Fm."; Dutchess Co.
Where: Dutchess County, New York (41.7° N, 73.8° W: paleocoordinates 32.7° S, 69.3° W)
• coordinate based on nearby landmark
• 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)
• formation-level stratigraphic resolution
Environment/lithology: shallow subtidal; stromatolitic, shelly/skeletal reef rocks
Size class: macrofossils
Preservation: cast
Collected by W. B. Dwight; reposited in the NYSM
• "Dwight’s collections, including his illustrated types (Dwight, 1884), were
•transferred from Vassar College in Poughkeepsie, New York, to the New York State Museum (NYSM) Paleontology Collection, probably in the first half of the
•20th century."
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 89492: authorized by Björn Kröger, entered by Torsten Liebrecht on 26.05.2009, edited by Björn Kröger
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Bassleroceras microscopium, "Cyrtoceras vassarina n. sp." = Bassleroceras vassarina, Bassleroceras spissiseptum
Bassleroceras microscopium Dwight 1884
"Cyrtoceras vassarina n. sp." = Bassleroceras vassarina Dwight 1884 NYSM 10367, 10370, 11423 (type, originally numbered 117), 17480 to 17482
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"Orthoceras henrietta n. sp." = Vassaroceras henrietta
"Orthoceras henrietta n. sp." = Vassaroceras henrietta Dwight 1884 no number of specimens and catalogue numbers given
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Dwightoceras dactyloides Dwight 1884 | |
Campbelloceras sp. Ulrich and Foerste 1936 NYSM 17518 (originally labeled by W. B. Dwight as "Eurystomites armilla n. sp.")
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Paraendoceras depressum, "? Endoceras wappingerense n. sp." = Paraendoceras wappingerense
"? Endoceras wappingerense n. sp." = Paraendoceras wappingerense Ulrich et al. 1944 NYSM 10371 (holotype), 17504 (hypotype of Kröger & Landing, 2008); both were originally numbered 301
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