Locality 40, unit 53, 8.2 feet below top (Silurian of Canada)

Where: Northwest Territories, Canada (74.8° N, 93.5° W: paleocoordinates 3.7° N, 34.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: A Member (Read Bay Formation), Wenlock (433.4 - 427.4 Ma)

• unit is 145 feet thick; fauna collected 8.2 feet below top of unit

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, argillaceous lime mudstone and poorly lithified shale

• Argillaceous limestone; light grey to medium dark-grey, weathering yellowish grey, very thin-bedded, flaggy, hard, dense, sublithographic to finely crystalline; a few beds medium to coarsely crystalline; irregularly bedded; light to medium grey shale partings constitute significant elements

Size class: macrofossils

Collected by R. Thorsteinsson in 1950-53; reposited in the GSC

Collection methods: surface (in situ),

Primary reference: R. Thorsteinsson. 1958. Cornwallis and Little Cornwallis Islands, District of Franklin, Northwest Territories. Geological Survey of Canada Memoirs 294:1-134 [M. Hopkins/M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188790: authorized by Melanie Hopkins, entered by Melanie Hopkins on 18.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Phacopida - Encrinuridae
 Phacopida - Calymenidae
Calymene "sp. A" Brongniart 1822 trilobite
 Proetida - Proetidae
 Strophomenida - Strophonellidae
 Athyridida - Meristellidae
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
 Spiriferida - Delthyrididae
Howellella "sp. A" Kozlowski 1946
 Rhynchonellida - Camarotoechiidae
Camarotoechia "sp. C" Hall and Clarke 1893
Cephalopoda indet. Cuvier 1797
 Trepostomata - Mesotrypidae