Section AV1, 641 m, Avalanche Lake Area, Mackenzie Mts. (Silurian of Canada)

Also known as Probable Fauna x, Section AV1, Delorme Fm., Avalanche Lake Area, Mackenzie Mts.

Where: Northwest Territories, Canada (62.4° N, 127.0° W: paleocoordinates 6.2° N, 50.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Delorme Formation, Wenlock (433.4 - 427.4 Ma)

• Authors call it Delorme Group. I'm calling it Delorme Formation for consistency with related collections. Based on position in section and faunal content, this probably correlates with Fauna x of sections AV4 and AV5.

• bed-level stratigraphic resolution

Environment/lithology: offshore shelf; dolomite and calcareous shale

• For entire Whittaker/Road River/Delorme suite: "The sediments were deposited in an area adjacent to the boundary between the Paleozoic continental shelf (Mackenzie shelf/platform) and the slope into the marginal Selwyn Basin."

•SEP environmental call based primarily on PBDB ref. 7215. could be slope

• For entire Whittaker/Road River/Delorme suite: "The sediments are predominantly carbonates with varying amounts of argillaceous material, ranging from fairly pure limestones, through argillaceous limestones and calcareous shales, to almost pure siliciclastic shales with some intervals containing minor to major amounts of chert." In stratigraphic column, this part of section is dolostone.

Size class: macrofossils

Preservation: replaced with silica

Primary reference: J. Jin and B. D. E. Chatterton. 1997. Latest Ordovician-Silurian articulate brachiopods and biostratigraphy of the Avalanche Lake area, southwestern District of Mackenzie, Canada. Palaeontographica Canadiana 13:1-62 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 26073: authorized by Michael Foote, entered by Michael Foote on 02.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Articulate brachiopods only.
Show authors, comments, and common names
Rhynchonellata
 Spiriferida - Cyrtiidae
Hedeina sp.
Hedeina sp. Boucot 1957
 Atrypida - Atrypidae
Atrypa (Gotatrypa) blodgetti
 Orthida - Dicoelosiidae
Epitomyonia clausula
Epitomyonia clausula Johnson et al. 1976
 Protorthida - Skenidiidae
Skenidioides operosa
Skenidioides operosa Johnson et al. 1976
Strophomenata
 Strophomenida - Leptellinidae
Leptellina (Merciella) mackenziensis
Leptellina (Merciella) mackenziensis Jin and Chatterton 1997
 Strophomenida - Furcitellidae
Pentlandina harperi