Where: Nunavut, Canada (72.7° N, 99.0° W: paleocoordinates 3.0° S, 30.5° W)
• coordinate based on political unit
• outcrop-level geographic resolution
When: Monograptus uniformis zone, Lochkovian (419.2 - 410.8 Ma)
• "...what appears to be fairly certainly established as the Monograptus uniformis-Warburgella rugulosa-Icriodus woschmidti Biozone."
• formation-level stratigraphic resolution
Environment/lithology: shallow subtidal; shelly/skeletal, gray, argillaceous, silty limestone and gray, silty, calcareous mudstone
• "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."
•SEP environmental call based on given info. and regional context
• "[working down] 4. Limestone; argillaceous, medium grey to brownish, irregularly bedded, fine-grained, [containing Warburgella and narrow zone of M. uniformis 2.75 m above base]; 3. Limestone; quartzose, medium grey, medium bedded, fine-grained, in part bioclastic; interbedded with minor fine-grained calcareous quartz sandstone and calcareous siltstone [Warburgella, conodonts, brachs, bivalves, ostracodes, cephalopods, scolecodonts, heterostracans]; 2. Limestone; argillaceous, medium grey, medium bedded, resistant; 1. Mudstone; calcareous and variably silty; medium grey, thin bedded, soft weathering; Warburgella..."
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 14026: authorized by Michael Foote, entered by Michael Foote on 08.05.2002
Creative Commons license: CC BY (attribution)
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