Where: British Columbia, Canada (53.0° N, 119.2° W: paleocoordinates 3.1° S, 79.6° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Bonnia-Olenellus trilobite zone, Mural Formation, Dyeran (516.0 - 513.0 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 zones is within the interval 4.1m below to 6.2m above the base of the middle mudstone member. NOTE: The Tah Formation has been renamed the Mural Formation by Burling. AGE: Waucoban; refined by A. Hendy (6/2009) on the basis of biostratigraphic data (= Bonnia-Olenellus zone).
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified shale
Size classes: macrofossils, mesofossils
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 10863: authorized by Mark Patzkowsky, entered by Phil Borkow on 28.06.2001
Creative Commons license: CC BY (attribution)