Where: Yukon, Canada (65.3° N, 140.9° W: paleocoordinates 0.0° N, 0.0° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Craggy Dolomite Formation (Fifteenmile Group), Tonian (1000.0 - 850.0 Ma)

• Originally assigned to "Unit 5" of the upper Tindir Group, and thought to be either latest Neoproterozoic or earliest Cambrian. Stratigraphic revisions by Macdonald et al. (2010) determined that the unit is the upper part of the Fifteenmile Group and U/Pb radiometric ages constrained the fossiliferous units to between 811.5 and 717.4 Ma.

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; lithified, gray, cherty/siliceous lime mudstone

Size class: microfossils

Preservation: permineralized, original carbon, replaced with silica

Collected by Carol Allison

Collection methods: peel or thin section

• Repository: University of Alaska Museum

Primary reference: C. W. Allison and S. M. Awramik. 1989. Organic-walled microfossils from earliest Cambrian or latest Proterozoic Tindir Group rocks, northwest Canada. Precambrian Research 43:253-294 [P. Cohen/M. Hernandez/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227531: authorized by Matthew Clapham, entered by Matthew Clapham on 14.10.2022

Creative Commons license: CC BY (attribution)