Also known as Loc. 61k, Mural Fm. (Tah Fm.), Nevadella Zone, Canada - Fritz 1992

Where: Alberta, Canada (53.2° N, 119.2° W: paleocoordinates 3.3° S, 79.6° W)

• outcrop-level geographic resolution

When: Nevadella trilobite zone, middle Member (Mural Tah Formation), Lenian (516.0 - 510.2 Ma)

• Deposits are from a glacial/moraine with source horizons found in nearby sections. Trilobites from below the upper Nevadella Zone and lower Bonnia-Olenellus boundary were found to have a restricted diversity, while those above are markedly different and exhibit diverse forms. The possible cause is a disconformity or a disconformity with an erosionally-erased biomere boundary. The exact stratigraphic placement of the specimens found by Walcott is not known and their placement into biozones is done by comparison to other sections. NOTE: The Tah Formation has been renamed the Mural Formation by Burling.

• formation-level stratigraphic resolution

Environment/lithology: limestone

Size class: macrofossils

Collection methods: Lithology and age of the sections were restudied by Fritz and Mountjoy in 1975 and additional collecting by Fritz and Mountjoy in 1971 and 1973 at Mumm Peak, Cinnamon Peak-Whitehorn Mountain, and Walcott's nearby sections are integrated into the study.

Primary reference: W. H. Fritz. 1992. Walcott's Lower Cambrian Olenellid trilobite collection 61k, Mount Robson Area, Canadian Rocky Mountains. Geological Survey of Canada Bulletin 432 (432)1-66 [M. Patzkowsky/P. Borkow/P. Borkow]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 10866: authorized by Mark Patzkowsky, entered by Phil Borkow on 29.06.2001

Creative Commons license: CC BY (attribution)