A0439b. Junction Cliff: Richmondian, Canada
collected by P. Copper

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Athyridida - Meristellidae
Hindella umbonata (Billings 1862)
Rhynchonellata - Orthida - Hesperorthidae
Ptychopleurella lamellosa (Raymond 1905)
Rhynchonellata - Orthida - Rhipidomellidae
Mendacella uberis (Billings 1866)
Strophomenata - Strophomenida - Sowerbyellidae
Thaerodonta glabra (Shaler 1865)
recombined as Eochonetes glabra
see common names

Geography
Country:Canada State/province:Quebec County:Anticosti Island
Coordinates: 49.9° North, 64.2° West (view map)
Paleocoordinates:22.6° South, 38.9° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Ordovician Epoch:Late/Upper Ordovician
Stage:Katian 10 m.y. bin:Ordovician 5
Key time interval:Richmondian Other zone: Hercochitina crickmayi
Age range of interval:449.80000 - 446.00000 m.y. ago
Stratigraphy
Formation:Vaureal Member:Grindstone
Stratigraphic resolution:bed
Stratigraphy comments: Collection A439 of Dewing 1999. Same collection names are used by Jin 1989, Jin and Zhan 2008, and Li and Copper 2006. Paraorthograptus pacificus zone.

The collection is noted by Dewing to be from the Grindstone to Velleda mbrs. We marked here the lowest Mbr. because we do not know which one the fossils came from.
Lithology and environment
Primary lithology:bioturbation,coarse lithified sandy,calcareous lime mudstone
Lithology description: 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."
Environment:carbonate indet. Tectonic setting:foreland basin
Taphonomy
Modes of preservation:body,original calcite
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:bulk,field collection
Reason for describing collection:taxonomic analysis
Collectors:P. Copper
Taxonomic list comments:Brachiopods only.
Metadata
Database number:163700
Authorizer:P. Wagner Enterer:P. Wagner
Modifier:P. Wagner
Created:2014-11-08 02:16:44 Last modified:2018-03-13 13:10:09
Access level:the public Released:2014-11-08 02:16:44
Creative Commons license:CC BY
Reference information

Primary reference:
44576. 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]

Secondary references:

65007 P. Copper, J. Jin, and A. Desrochers. 2013. The Ordovician-Silurian boundary (late Katian-Hirnantian) of western Anticosti Island: revised stratigraphy and benthic megafaunal correlations. Stratigraphy 10(4):213-227 [P. Wagner/P. Wagner]