District of Mackenzie, Royal Creek Section, Unit 4, Road River Formation (Silurian of Canada)

Where: Northwest Territories, Canada (65.1° N, 135.2° W)

• Paleocoordinates: 5.5° N, 101.0° W (Wright 2013)

• coordinate stated in text

• outcrop-level geographic resolution

When: Road River Formation, Silurian (443.8 - 419.2 Ma)

• Collection taken from 2007-2012 ft above the base of the bed.

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal; gray shale and argillaceous limestone

• "Shale, limy, dark grey, weathers dark grey and dark brownish grey, recessive but less so than units 3 and 5; argillaceous limestone, 10 to 50%, very finely crystalline, grey and dark grey, weathers grey, and yellowish grey, bedding 1 inch to 8 inches, commonly concretionary; paper shale, non-limy, weathers brownish black, rare grey siltstone, weathers dark brownish grey; rare siliceous limestone, weathers brownish grey.

Size class: macrofossils

Collection methods: Collection also includes dendroid graptolites.

Primary reference: B. S. Norford. 1963. Reconnaissance of the Ordovician and Silurian rocks of Northern Yukon Territory. Geological Survey of Canada Department of Mines and Technical Surveys, Paper 63(39):1-139 [S. Holland/T. Hanson/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 25491: authorized by Steven Holland, entered by Tori Hanson on 13.09.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Monograptidae
Monograptus sp.
Monograptus sp. graptolite
Tentaculita
 Styliolinida - Styliolinidae
cf. Styliolina sp.
cf. Styliolina sp. Karpinsky 1884