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Palaeontology and stratigraphy of the middle Cambrian Stephen Formation, western Canadian Rocky Mountains
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Pamona College.
Royal Ontario Museum Toronto.
2011 (English)In: The 2nd Wiman Meeting: Carl Wiman's Legacy: 100 years of Swedish Palaeontology, Uppsala, 2011, 22-22 p.Conference paper, Published paper (Refereed)
Abstract [en]

The middle Cambrian Stephen Formation of the western Canadian Rocky Mountains might be best known for including the famous Burgess Shale with its exceptionally preserved fossils. Likewise remarkable is, however, its depositional setting, which was characterized by the presence of a submarine cliff that divided the environment into a deeper, basinal and a shallower part. This division, caused by the so called Cathedral Escarpment, resulted in the development of two distinct regional expressions of the formation, a thick, i.e., basinal, and a thin, i.e., shallower, one. Whereas previous paleontological studies of the Stephen Formation mainly focused on the exceptional preserved fauna and its macroscopic fossils, we present here the first systematic study of the microfossil content of the limestone horizons occurring throughout the formation. Five sections of the thin and thick Stephen Formation have been measured and sampled in Yoho and Kootenay National Park. In total, samples from over 130 horizons have been dissolved in diluted formic acid revealing a variable fauna of dominantly phosphatic shelled brachiopods (mainly Acrothyra and Paterina, but also lingulids and zhanatellids) and trilobites (mainly ptychoparids and Pagetia; other trilobites and agnostids are rare). Locally recrystallized echinoderm ossicles, which can be referred to ctenocystoids and edrioasteroids, and a variety of siliceous sponge spicules are common. Molluscs, such as helcionellids, stenothecoids, or hyoliths, are present, but typically form only an insignificant part of the associations. Bradoriids as well as protoconodonts are rare and have only been found in individual horizons. The evaluation of the distribution of the fauna in the individual sections aims towards a detailed correlation of the sections, a more exhaustive biostratigraphy, and a better understanding of the regional variability of the formation.

Place, publisher, year, edition, pages
Uppsala, 2011. 22-22 p.
National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-165210OAI: oai:DiVA.org:uu-165210DiVA: diva2:472457
Conference
The 2nd Wiman Meeting, EBC, Uppsala 17 - 18 November 2011
Available from: 2012-01-03 Created: 2012-01-03 Last updated: 2013-10-22Bibliographically approved

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Streng, Michael

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