CN-18-38 (Ordovician of Canada)

Where: Newfoundland and Labrador, Canada (51.6° N, 55.9° W: paleocoordinates 30.1° S, 45.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Strigigenalis caudata trilobite zone, Catoche Formation (St. George Group), Cassinian (478.6 - 468.1 Ma)

Environment/lithology: peritidal; lithified, gray lime mudstone and wackestone

• "dark blue-gray weathering, thin rubbly bedded, bioturbated; top of bed contains thin lenses of skeletal limes packstone and grainstone and spectacular patches of diagenetic dolostone-pseudobreccia [='primary dolostone that has been intensely, diagenetically dolomitized so that the original rock remains only as clots, streaks, and small masses surrounded by prismatic crystals and mosaics of white sparry dolomite'], white weathering."

Size class: macrofossils

Collected by W. D. Boyce in 1976-87

• 10.8 meter unit collected at cm scale but only trilobite ranges reported.

Primary reference: W. D. Boyce. 1989. Early Ordovician trilobite faunas of the Boat Harbour and Catoche Formations (St. George Group) in the Boat-Harbour-Cape Norman area, Great Northern Peninsula, western Newfoundland. Geological Survey Branch, Department of Mines and Energy, Newfoundland and Labrador, Report 89-2 1-168 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 106241: authorized by Melanie Hopkins, entered by Melanie Hopkins on 04.03.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Corynexochida - Illaenidae
Illaenus sp. Dalman 1827 trilobite
 Phacopida - Pliomeridae
Strotactinus insularis Billings 1865 trilobite
 Proetida - Dimeropygidae
Ischyrotoma anataphra Fortey 1979 trilobite
 Proetida - Bathyuridae
Petigurus nero Billings 1865 trilobite
Catochia ornata Fortey 1979 trilobite
Bolbocephalus convexus Billings 1865 trilobite
Bolbocephalus kindlei Boyce 1989 trilobite
"Jeffersonia angustimarginata" = Jeffersonia jenni Cullison 1944 trilobite
Jeffersonia timon Billings 1865 trilobite
Benthamaspis conica Fortey 1979 trilobite
Benthamaspis cf. conica Fortey 1979 trilobite
Bathyurellus abruptus Billings 1865 trilobite
Uromystrum cf. affine Poulsen 1937 trilobite
Strigigenalis caudata Billings 1865 trilobite
 Asaphida - Asaphidae
"Isoteloides latimarginatus" = Isoteloides canalis
"Isoteloides latimarginatus" = Isoteloides canalis Whitfield 1886 trilobite