Locality 4, unit 6 (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, Ashgillian to Ashgillian (449.5 - 427.4 Ma)

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

• Dolomite; biostromal, brownish grey, stained brownish black by bituminous residue, weathering to greyish yellow, thin-bedded, slabby, hard, vuggy, 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 188780: 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
 Stromatoporida - Stromatoporidae
? Stromatopora sp. Goldfuss 1826
 Clathrodictyida - Clathrodictyidae
Clathrodictyon sp. Nicholson and Murie 1878
 Favositida - Favositidae
Favosites "sp. B aff. pyriformis" Lamarck 1816 tabulate coral
Favosites favosus Goldfuss 1826 tabulate coral
 Favositida - Micheliniidae
? Michelinia sp. de Koninck 1841 tabulate coral
 Heliolitida - Halysitidae
Halysites catenulatus tabulate coral
Halysites sp. von Waldheim 1813 tabulate coral
 Cystiphyllida - Tryplasmatidae
Porpites "sp. A aff. propitus" Schlotheim 1820 horn coral
Porpites "sp. B" Schlotheim 1820 horn coral
 Cystiphyllida - Palaeocyclidae
Rhabdocyclus sp. Lang and Smith 1939 horn coral
 Stauriida - Amplexidae