Also known as Loc. 90596, Type Tah Section, Mural Fm, Canada - Fritz 1992

Where: Alberta, Canada (53.2° N, 119.1° W)

• Paleocoordinates: 38.7° N, 123.6° W (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• 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 boundary between the Nevadella and Bonnia-Olenellus Zone is covered, however a close match of the lithology within the upper and lower members of the Mural Formation at other sections leaves little doubt that the boundary is within the lower part of the middle member or else below the lower-middle member contact. NOTE: The Tah Formation has been renamed the Mural Formation by Burling.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified dolomite

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 10865: authorized by Mark Patzkowsky, entered by Phil Borkow on 28.06.2001

Creative Commons license: CC0 (CC0)