ammonites
Atrypa-Dicoelosia-Ramose Bryozoan Subcommunity of the Lower Rochester Shale at M (Silurian of the United States)

Where: Niagara County County, New York (43.1° N, 79.1° W: paleocoordinates 28.4° S, 43.0° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Lewiston Member (Rochester Shale Formation), Wenlock (428.2 - 422.9 Ma)

• Collection is from Submember B of the Lewiston Member, 3-3.5 m above the base.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray, calcareous mudstone and lithified, calcareous siltstone

• 2003:04:06 SEP environmental/tectonic/sequence calls based on field knowledge familiarity with stratigraphic context.
• This bryozoan rich community is associated with light to medium gray, calcareous mudstones. Associated lithologies include calcisiltites and lenticular calcarenites, rarely displaying upward fining, mudsheltering (matrix trapped in protected pockets beneath shells during winnowing) and/or starved ripple features. Brett (1983) considered that these coquinoid beds represent winnowed storm layers and suggested deposition within storm wave base.

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 13050: authorized by Michael Foote, entered by Kimberly Koverman on 17.01.2002