Bed 12, Section 5 - Bluish Grey Shale Division, Richardson Mtns (Cretaceous of Canada)

Also known as Bed 12, Field No. 138

Where: Yukon, Canada (67.9° N, 137.3° W: paleocoordinates 68.7° N, 68.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bluish Grey Shale Formation, Berriasian (145.0 - 139.8 Ma)

• 360 ft thick shale, about 2432 ft above base of section; classified as "bluish grey shale division" in Jeletzky (1961); Jeletzky (1961) assigns this unit a Berrisian age.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, black, brown, gray, silty shale

• No paleoenvironmental data reported.
• Shale, dark grey to black and bluish tinged where fresh, brown-grey where weathered; silty to pure, soft, chippy weathering.

Size class: macrofossils

Preservation: concretion

Reposited in the GSC

Collection methods: surface (float),

• Collections presumably reposited in Geological Survey of Canada.

Primary reference: J. A. Jeletzky. 1961. Upper Jurassic and Lower Cretaceous rocks, west flank of Richardson Mountains between the headwaters of Blow River and Bell RIver, Yukon Territory. Geological Survey of Canada, Paper 61(9):1-27 [A. Miller/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 55938: authorized by Austin Hendy, entered by Austin Hendy on 08.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• List appears not to be exhaustive, and somewhat taxonomically archaic.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Polyptychitidae
"Polyptychites ex gr. keyserlingi" = Polyptychites (Polyptychites) keyserlingi
"Polyptychites ex gr. keyserlingi" = Polyptychites (Polyptychites) keyserlingi Neumayr and Uhlig 1881 ammonite
Bivalvia
 Pectinida - Buchiidae
Buchia aff. crassa, Buchia cf. keyserlingi
Buchia cf. keyserlingi Lahusen 1888 scallop