ammonites
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reservoir spillway near Spring Coulee (Cretaceous of Canada)

Where: Alberta, Canada (49.4° N, 113.1° W: paleocoordinates 57.4° N, 85.5° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Twin Mountains Formation, Maastrichtian (70.6 - 66.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: fluvial; siltstone

• most occur in a layer of gray siltstone about 20cm thick

•pond or overbank flood deposit

Size class: microfossils

Preservation: adpression

Primary reference: R. A. Stockey and G. W. Rothwell. 1997. The aquatic angiosperm Trapago angulata from the Upper Cretaceous (Maastrichtian) St. Mary River Formation of Southern Alberta. International Journal of Plant Sciences 158(1):83-94 [S. Wing/N. Jud] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 106007: authorized by Scott Wing, entered by Nathan Jud on 01.03.2011

Creative Commons license: CC BY (attribution)