A0723 (Silurian of Canada)

Also known as A761

Where: Quebec, Canada (49.3° N, 62.0° W: paleocoordinates 22.1° S, 35.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Merrimack Formation, Rhuddanian (443.4 - 440.8 Ma)

• Collection A723 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, calcareous mudstone and lithified, calcareous grainstone

• 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 Merrimack Formation (Copper and Long 1989) consists of up to 25 m of dark grey, recessive weathering calcareous mudstones, with minor micrites and calcarenites. At the east end of the island the formation contains a few prominent ledges of medium to fine sand-grade calcarenite, characterized by hummocky or swaley cross-stratification. Some of these laterally discontinuous beds have scoured bases. Abrupt lateral termination of some beds may indicate early lithification and partial removal by later storms (Fig. 4A). Associated resistant ledges of apparently massive micrite may also be of storm origin. They are characteristically 10 to 12 cm thick and have a sharp flat to wavy base, and a pitted top, with 5% to 10% Planolites burrows."

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 158823: 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 (Brachyprion) leda" = Brachyprion leda, Brachyprion (Brachyprion) sp.
"Brachyprion (Eomegastrophia) philomela" = Strophomena philomela Billings 1860
"Brachyprion (Brachyprion) leda" = Brachyprion leda Billings 1860
Rhynchonellata
 Orthida - Rhipidomellidae
Mendacella udauberis
Mendacella udauberis Li and Copper 2006