Locality 21 (Silurian of Canada)

Where: Northwest Territories, Canada (74.7° N, 93.5° W: paleocoordinates 1.9° N, 32.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: C Member (Read Bay Formation), Ludlow (427.4 - 423.0 Ma)

• unit is 20 feet thick at approximately 500 feet above base of member

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified reef rocks

• "biostrome"

Size class: macrofossils

Preservation: cast, replaced with silica

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

Collection methods: surface (in situ), chemical,

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: biostratigraphic analysis

PaleoDB collection 188900: authorized by Melanie Hopkins, entered by Melanie Hopkins on 20.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Lichida - Lichidae
"Hemiarges aquilonius n. sp." = Richterarges aquilonius
"Hemiarges aquilonius n. sp." = Richterarges aquilonius Whittington 1961 trilobite
Crinoidea indet. Miller 1821 Sea lily
 Favositida - Favositidae
Favosites aff. forbesi tabulate coral
Favosites sp. Lamarck 1816 tabulate coral
 Favositida - Pachyporidae
? Striatopora sp. Hall 1851 tabulate coral
 Cystiphyllida - Cystiphyllidae
? Cystiphyllum sp. Lonsdale 1839 horn coral
 Stauriida - Amplexidae
 Stauriida - Streptelasmatidae
? Streptelasma sp. Hall 1847 horn coral
 Stauriida - Acervulariidae