Bathurst Island Fmn. in Twilight Creek Section (Devonian of Canada)

Where: Nunavut, Canada (73.4° N, 99.1° W: paleocoordinates 2.5° S, 30.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Bathurst Island Formation, Lochkovian (419.2 - 410.8 Ma)

• formation-level stratigraphic resolution

Environment/lithology: submarine fan; silty, sandy shale and calcareous sandstone

• "Throughout much if not all of the Archipelago, the boundary between the Silurian and Devonian Systems, as presently defined, is transitional and not represented by a hiatus. Moreover, the S-D boundary is represented in contrasting facies: graptolitic, shelly, redbeds, and flysch deposits. The graptolitic rocks occur in outer parts of the Franklinian Geosyncline, and are exposed on Melville, Bathurst, Cornwallis, Baillie Hamilton, Devon and Ellesmere Islands. The shelly facies occurs in inner parts of the F.G. and on the adjoining Arctic Platform, and is exposed on Victoria, Stefansson, Cornwallis, Devon and Ellesmere Islands. The redbeds crop out in the environs of a prominent cratonic uplift (Boothia Uplift) on Cornwallis and Prince of Wales Islands. Outcrops of the flysch deposits are confined to northern Ellesmere Island."
• [Lithology based on illustrated section.]

Size class: macrofossils

Collection methods: I have combined collecting levels 759.5, 915, 960.75, 985, and 1009.5 m above base of section.

Primary reference: J. W. Kerr, D. J. McLaren, and R. Thorsteinsson. 1977. Canadian Arctic Archipelago. In A. Martinsson (ed.), The Silurian-Devonian boundary (IUGS, Series A, Number 5) 281-288 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 14023: authorized by Michael Foote, entered by Michael Foote on 08.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Monograptidae
Monograptus thomasi, Monograptus yukonensis
Monograptus yukonensis Lenz and Jackson 1963 graptolite
Tentaculita
 Nowakiida - Nowakiidae
Nowakia sp.
Nowakia sp. Gurich 1896