ammonites
District of Mackenzie, Ogilvie River Section, Unit 2 Road River Formation (Ordovician to of Canada)

Where: Northwest Territories, Canada (65.4° N, 138.3° W: paleocoordinates 14.5° N, 53.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Road River Formation, Middle Ordovician to Middle Ordovician (471.8 - 460.9 Ma)

• Probably Upper Ordovician.

• formation-level stratigraphic resolution

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

• "Covered interval with very rare outcrops of shale, limy and non-limy, greyish black and brownish black, weathers greyish black and yellowish grey; minor bedded chert, impure, some limy, dark grey, weathers dark grey, bedding 1/4 to 1 inch; minor argillaceous limestone, dark grey, weathers dark grey and brownish grey, bedding 2 to 6 inches, irregular."

Size class: macrofossils

Collection methods: Collection also includes brachiopods, trilobite, and diplograptid 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/T. Hanson] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 25528: authorized by Steven Holland, entered by Tori Hanson on 15.09.2002