C706. Laloutre road (Ordovician of Canada)

Also known as A515

Where: Quebec, Canada (49.8° N, 63.6° W: paleocoordinates 22.9° S, 38.5° 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)

• Upper part of member. Collection C706 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, bioturbated, coarse-grained, sandy, 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 Grindstone Member, at its type section on the north-east coast of Anticosti Island, consists of >14 m of lami-nated to thin-bedded, very fine sandstones (subfeldspathic to feldspathic bioarenites) and minor laminated calcareous mudstones. These mixed siliciclastic–carbonate sandstones appear to be restricted to the east end of the island; within 15 km of the type section they pass into sandy limestones. To the west, at Vauréal Falls, they are dominated by highly bioturbated thin-bedded micrites, interbedded with thin to thick beds of calcarenite of coarse sand to granule grade. At the west end of the island the member consists of 21 m of predominantly laminated to thin-bedded planar to wavy laminate (irregular, subnodular) micrites, with abundant bioturbation. Grainstones are rare and are typically discontinuous lenticular."

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 158587: authorized by Seth Finnegan, entered by Seth Finnegan on 21.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Show authors, comments, and common names
Strophomenata
 Orthotetida - Chilidiopsidae
Coolinia gamachiana
Coolinia gamachiana Twenhofel 1928
 Strophomenida - Sowerbyellidae
Sowerbyella (Eochonetes) sp., "Thaerodonta glabra" = Eochonetes glabra
"Thaerodonta glabra" = Eochonetes glabra Shaler 1865
 Strophomenida - Leptostrophiidae
Aphanomena planoconvexa
 Strophomenida - Strophomenidae
"Leptaena quadrilatera" = Strophomena rhomboidalis
"Leptaena quadrilatera" = Strophomena rhomboidalis Logan 1863
Rhynchonellata
 Athyridida - Meristellidae
Hindella umbonata
Hindella umbonata Billings 1862
 Atrypida - Atrypinidae
Eospirigerina sp.
Eospirigerina sp. Schuchert and Cooper 1930
 Rhynchonellida - Rhynchotrematidae
Hypsiptycha anticostiensis1
 Orthida - Rhipidomellidae
Mendacella uberis2
Mendacella uberis2 Billings 1866
5 shells.
 Orthida - Dalmanellidae
Onniella tricapitata2
Onniella tricapitata2 Jin and Zhan 2008
190 conjoined shells, 8 ventral valves, 2 dorsal valves.
 Orthida - Plaesiomyidae
Plaesiomys anticostiensis2
Plaesiomys anticostiensis2 Shaler 1865
3 conjoined shells.
 Orthida - Hesperorthidae
Barbarorthis laurentina2
Barbarorthis laurentina2 Billings 1857
2 conjoined shells.
 Orthida - Plectorthidae
Hebertella maria2
Hebertella maria2 Billings 1862
87 conjoined shells, 10 ventral valves, 7 dorsal valves.
1Jin 1989; 2Jin and Zhan 2008