A1517. Cailloux Road (Ordovician of Canada)

Where: Quebec, Canada (49.7° N, 63.8° W: paleocoordinates 22.9° S, 38.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Same collection names are used by Jin 1989, Jin and Zhan 2008, and Li and Copper 2006. Hercochitina crickmayi chitinozoan zone.

• member-level stratigraphic resolution

Environment/lithology: lithified, bioturbated, coarse-grained, sandy, calcareous 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; reposited in the GSC

Collection methods: bulk,

Primary reference: J. Jin and R. Zhan. 2008. Late Ordovician Orthide and Billingsellide Brachiopods from Anticosti Island, Eastern Canada: Diversity Change Through Mass Extinction. National Research Council of Canada Monograph Series [S. Finnegan/S. Finnegan]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 163793: authorized by Pete Wagner, entered by Pete Wagner on 12.11.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
Rostricellula transversa
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema nutrix
Rhynchotrema nutrix Billings 1866
 Athyridida - Meristellidae
Hindella umbonata
Hindella umbonata Billings 1862
 Orthida - Platystrophiidae
Vinlandostrophia regularis