PBDB Collection

A0647. Rivière Trois Milles (Ordovician of Canada)

Also known as A425

Where: Quebec, Canada (49.8° N, 64.3° W: paleocoordinates 22.7° S, 38.9° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Paraorthograptus pacificus graptolite zone, Grindstone Member (Vaureal Formation), Richmondian (449.6 - 445.5 Ma)

• Collection A647 of Dewing 1999. Same collection names are used by Jin 1989, Jin and Zhan 2008, and Li and Copper 2006. Hercochitina crickmayi zone.

• bed-level stratigraphic resolution

Environment/lithology: lithified, gray, calcareous lime mudstone and lithified, gray, carbonaceous sandstone

• 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 Ellis Bay Formation consists of 52 to 72 m of predominantly grey strata that pass from micritic limestones with abundant sets of calcareous mudstone layers at the west end of the island, to micrites plus mixed carbonate-siliciclastic sandstones at the east end (Long and Copper 1987b). The formation marks a period of faunal change from typical Ordovician to Silurian fauna and includes the type section of the Gamachian in North America. An exclusive Hirnantian age for the formation is disputed by some authors, who believe that most of the formation is of latest Rawtheyan age and that only the uppermost one or two members are Hirnantian (Brenchley et al. 1994; Fortey et al. 1995; Underwood et al. 1997). The formation has been formally divided into six members by Long and Copper (1987a)."

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 158864: 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

Rhynchonellata
Pentamerida - Parastrophinidae	Parastrophinella sp. Parastrophinella sp. Schuchert and Cooper 1931
Orthida - Rhipidomellidae	Mendacella uberis Mendacella uberis Billings 1866
Orthida - Plaesiomyidae	Plaesiomys anticostiensis Plaesiomys anticostiensis Shaler 1865
Orthida - Plectorthidae	Hebertella maria Hebertella maria Billings 1862
Orthida - Platystrophiidae	Vinlandostrophia regularis Vinlandostrophia regularis Shaler 1865
Athyridida - Meristellidae	Hindella umbonata Hindella umbonata Billings 1862
Atrypida - Atrypinidae	Eospirigerina sp. Eospirigerina sp. Schuchert and Cooper 1930
Strophomenata
Orthotetida - Chilidiopsidae	Coolinia gamachiana Coolinia gamachiana Twenhofel 1928
Billingsellida - Clitambonitidae	Vellamo diversa Vellamo diversa Shaler 1865
Strophomenida - Strophomenidae	"Leptaena quadrilatera" = Strophomena rhomboidalis "Leptaena quadrilatera" = Strophomena rhomboidalis Logan 1863
Strophomenida - Sowerbyellidae	Sowerbyella (Eochonetes) sp., Eochonetes glabra Sowerbyella (Eochonetes) sp. Reed 1917 Eochonetes glabra Shaler 1865
Strophomenida -	Archeochonetes muirwoodae Archeochonetes muirwoodae Racheboeuf and Copper 1986