Locality 4, unit 4 (Ordovician to of Canada)

Where: Northwest Territories, Canada (74.7° N, 94.8° W: paleocoordinates 6.5° N, 37.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Allen Bay Formation, Ashgill to Ashgill (449.5 - 427.4 Ma)

Environment/lithology: marine; lithified, gray, carbonaceous dolomite

• Dolomite; biostromal, greyish-orange, weathering similar, thick-bedded, blocky, hard, porous, finely crystalline; petroliferous odour when struck or broken

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: taxonomic analysis

PaleoDB collection 188781: authorized by Melanie Hopkins, entered by Melanie Hopkins on 18.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by A. E. Wilson
Show authors, comments, and common names
Gastropoda
 Murchisoniina - Loxonematidae
? Loxonema sp.
? Loxonema sp. Phillips 1841 snail
Anthozoa
 Cystiphyllida - Palaeocyclidae
Rhabdocyclus sp.
Rhabdocyclus sp. Lang and Smith 1939 horn coral
 Cystiphyllida - Tryplasmatidae
Porpites "sp. A aff. porpitus"
Porpites "sp. A aff. porpitus" Schlotheim 1820 horn coral
 Stauriida - Amplexidae
Amplexus cf. propinguis
 Stauriida - Streptelasmatidae
Streptelasma sp.
Streptelasma sp. Hall 1847 horn coral
 Favositida - Favositidae
Favosites sp.
Favosites sp. Lamarck 1816 tabulate coral
 Heliolitida - Halysitidae
"Halysites catenulatus" = Halysites catenularius
"Halysites catenulatus" = Halysites catenularius Linnaeus 1767 tabulate coral
possible subspecies nitidus
Stromatoporoidea
 Clathrodictyida - Clathrodictyidae
? Clathrodictyon variolare
? Clathrodictyon variolare Rosen 1867 stromatoporoid sponge