Bed 18, Section 7 - Rat River Fm, Aklavik Range (Cretaceous of Canada)

Also known as Field No. 20, Bed 18

Where: Northwest Territories, Canada (68.1° N, 135.6° W)

• Paleocoordinates: 76.7° N, 51.1° W (Wright 2013)

• coordinate stated in text

• outcrop-level geographic resolution

When: Rat River Formation, Aptian (125.0 - 113.0 Ma)

• 30 ft thick sandstone, 191.5-207 ft from base of section; classified as "upper sandstone division" in Jeletzky (1958); Jeletzky (1958) and Fowler and Braun (1993) assign this unit an Aptian age.

• bed-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, fine-grained, black, brown sandstone

• No environmental data reported.
• Sandstone, grey to brown, buff to rusty weathered, fine-grained.

Size class: macrofossils

Reposited in the GSC

Collection methods: quarrying,

• Collected by Jeletzky; presumably reposited in GSC collections .

Primary reference: J. A. Jeletzky. 1958. Uppermost Jurassic and Cretaceous rocks of Aklavik Range, Northeastern Richardson Mountains, Northwest Territories. Geological Survey of Canada, Paper 58(2):1-84 [A. Miller/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 55864: authorized by Austin Hendy, entered by Austin Hendy on 06.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Collection appears not to be exhaustive.
Bivalvia
 Nuculida - Nuculidae
? Nucula sp. Lamarck 1799 nut clam
 Thraciida - Thraciidae
? Thracia sp. Blainville 1824 clam
Presumably mis-spelled in text, as "Tracia"
 Cardiida - Arcticidae
? Arctica sp. Schumacher 1817 clam
 Cardiida - Tancrediidae
? Tancredia sp. Lycett 1850 clam
 Pectinida - Buchiidae
 Pectinida - Entoliidae
"Pecten (Entolium) sp." = Entolium
"Pecten (Entolium) sp." = Entolium Meek 1865 scallop