Bed 29, Section 5 - Dark Grey Siltstone Division, Richardson Mtns (Cretaceous of Canada)

Also known as Bed 29, Field No. 138

Where: Yukon, Canada (67.9° N, 137.3° W: paleocoordinates 70.9° N, 67.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Dark Grey Siltstone Formation, Barremian (129.4 - 125.0 Ma)

• 800 ft thick siltstone, about 4,372 ft above base of section; classified as "dark grey siltstone division" in Jeletzky (1961); Jeletzky (1961) assigns this unit a Barremian age.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, concretionary, brown, gray, sandy siltstone

• No paleoenvironmental data reported.
• Siltstone, dark grey where fresh, brownish tinged and rubbly where weathered, sandy, soft; rare concretions.

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 55937: 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.
Bivalvia
 Myalinida - Inoceramidae
Inoceramus sp. Sowerby 1814 clam
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel