Where: Nunavut, Canada (65.8° N, 113.8° W: paleocoordinates 0.0° N, 0.0° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Rocknest Formation (Epworth Group), Orosirian (2050.0 - 1800.0 Ma)

• From near transition between Basal Member and Lower Shale Member. Age constrained by the Hackett tuff (1969 +/- 1 Ma) at the base of the Odjick Formation and the Fontano Tuff (1882.5 +/- 0.95 Ma) at the top of the Rocknest Formation (Hofmann et al., 2011).

• group of beds-level stratigraphic resolution

Environment/lithology: peritidal; lithified, stromatolitic dolomite

Size class: microfossils

Preservation: permineralized, original carbon, replaced with silica

Reposited in the GSC

Primary reference: H. J. Hofmann and J. P. Grotzinger. 1985. Shelf-facies microbiotas from the Odjick and Rocknest formations (Epworth Group; 1.89 Ga), northwestern Canada. Canadian Journal of Earth Sciences 22:1781-1792 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227733: authorized by Matthew Clapham, entered by Matthew Clapham on 28.10.2022

Creative Commons license: CC BY (attribution)