District of Mackenzie, Tatonduk River Headwaters Section, Unit 7 Road River Fm (Ordovician of Canada)

Where: Northwest Territories, Canada (65.4° N, 140.3° W: paleocoordinates 13.8° N, 55.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Road River Formation, Caradoc (458.4 - 449.5 Ma)

• Ordovician, Llandeilo or Caradoc. Collection taken from 1595-1598 feet above base.

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal; gray, argillaceous, cherty/siliceous limestone

• "Limestone, somewhat argillaceous, very finely crystalline with bioclastic debris, dark grey, weathers grey, recessive, bedding 1 inch to 8 inches; some irregular silicification.

Size class: macrofossils

Collection methods: Collection also includes straight cephalopod, sponge spicules, solitary coral, and brachiopods. Ostracod identified by Copeland.

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 25533: authorized by Steven Holland, entered by Tori Hanson on 15.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Ostracoda
 Podocopida - Bythocyprididae
cf. Bythocypris sp.
cf. Bythocypris sp. Brady 1880 ostracod
cf. "Bythocypris" sp.
Trilobita
 Asaphida - Remopleurididae
cf. Robergia sp.
cf. Robergia sp. Wiman 1905 trilobite
Pterobranchia
 Graptoloidea - Retiolitidae
Glyptograptus sp.
Anthozoa
 Sarcinulida - Syringophyllidae
cf. Calapoecia sp.
cf. Calapoecia sp. Billings 1865 tabulate coral