A722 (Silurian of Canada)

Where: Quebec, Canada (49.3° N, 61.9° W: paleocoordinates 21.5° S, 34.6° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Lachute Member (Gun River Formation), Aeronian (440.8 - 438.5 Ma)

• Collection A722 of Dewing 1999. Same collection names are used by Jin 1989, Jin and Zhan 2008, and Li and Copper 2006.

• bed-level stratigraphic resolution

Environment/lithology: lithified, bioturbated, lag, nodular, gray, calcareous lime mudstone

• Member description taken from 2007 Long. Tempestite frequency curves: a key to Late Ordovician and Early Silurian subsidence, sea-level change, and orbital forcing in the Anticosti foreland basin, Quebec, Canada. Can. J. Earth Sci. Vol. 44, 413-431. "The Lachute member consists of 14 to 16 m of resistant weathering, light to medium grey, thinly bedded (2 to 5 cm), irregular to nodular micrites with abundant mudstone partings and minor bioclastic lags. Most of the micrites appear massive, although some exhibit thin planar lamination. The calcareous mudstone partings that form 5% to 10% of the member are usually <2 cm thick and decrease in abundance upsection. The upper 3 m of the member are predominantly weakly bioturbated (bioturbation index, BI = 2: Droser and Bottjer 1989) subnodular micrites, with <5% mudstone partings and minor discontinuous intraformational conglomerate in lenses (? gutter fills) up to 4 cm deep and 40 cm wide."

Size classes: macrofossils, mesofossils

Preservation: original calcite

Collected by P. Copper

Collection methods: bulk,

Primary reference: K. Dewing. 1999. Late Ordovician and Early Silurian strophomenid brachiopods of Anticosti Island, Quebec, Canada. In A. D. McCracken (ed.), Palaeontographica Canadiana 17:1-143 [S. Finnegan/S. Finnegan]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 158834: authorized by Seth Finnegan, entered by Seth Finnegan on 22.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Show authors, comments, and common names
Strophomenata
 Strophomenida - Leptostrophiidae
Brachyprion (Eomegastrophia) sp., "Brachyprion (Eomegastrophia) philomela" = Strophomena philomela
"Brachyprion (Eomegastrophia) philomela" = Strophomena philomela Billings 1860