Cow Head Peninsula [Downes Point Mbr, Shallow Bay Fm] (Cambrian of Canada)

Where: Newfoundland and Labrador, Canada (49.9° N, 57.8° W: paleocoordinates 38.1° S, 68.5° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Downes Point Member (Shallow Bay Formation), Arcadian (509.0 - 498.4 Ma)

• Approximately 100m thick. Many of the boulder clasts in the conglomerate appear to have been reworked from older sediments. A number of Middle Cambrina taxa were recovered from clasts in beds believed to be Sunwaptan in age. Note: Represents beds 1-5 from James and Stevens (1986), however fossils found only in beds 3-5. AGE: Arcadian; refined by A. Hendy (6/2009) on the basis of biostratigraphic data.

• group of beds-level stratigraphic resolution

Environment/lithology: slope; lithified conglomerate and lithified lime mudstone

• Part of the Humber Arm allochton in which the source of the allochthonous carbonate sediment is a platform that lay to the west.
• conglomerates with minor interbeds of lime mudstone and shale, and some grainstone

Size classes: macrofossils, mesofossils

Collection methods: chemical, mechanical,

Primary reference: S. P. Robson and B. R. Pratt. 2001. Cambrian and Ordovician linguliform brachiopods from the Shallow Bay Formation (Cow Heard Group), Western Newfoundland. Journal of Paleontology 75(2):241-260 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 10768: authorized by Mark Patzkowsky, entered by Phil Borkow on 21.06.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Protreta interrupta
9 ventral and 2 dorsal
Lingulata
 Lingulida - Acrothelidae
Orbithele sp. Sdzuy 1955
8 ventral valves and 4 dorsal valves (plus fragments)
 Acrotretida - Acrotretidae
"Pegmatreta sp." = Linnarssonia Walcott 1885
4 ventral valves
Picnotreta laphocarita n. sp.
11 ventral and 11 dorsal
Picnotreta robusta Holmer et al. 1999
11 ventral and 3 dorsal
Dactylotreta patriella
11 ventral valves
Neotreta humberensis n. sp.
3 ventral and 1 dorsal
Paterinata
 Paterinida - Paterinidae
Micromitra modesta
2 ventral and 2 dorsal