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Taphonomy and depositional setting of the Burgess Shale Tulip Beds, Mount Stephen, British Columbia

Lorna J. O'Brien, Jean-Bernard Caron and Robert R. Gaines
Taphonomy and depositional setting of the Burgess Shale Tulip Beds, Mount Stephen, British Columbia
Palaios (June 2014) 29 (6): 309-324

Abstract

Burgess Shale-type deposits represent exceptional preservational windows for examining the biodiversity and ecological structure of some of the earliest metazoan communities that evolved during the Cambrian Explosion. While much attention has been paid to the original Burgess Shale locality, the Walcott Quarry on Fossil Ridge, temporal and regional variations of the depositional environment of the Burgess Shale biota as a whole are still poorly understood. Here we present the first comprehensive taphonomic and sedimentological study of the Tulip Beds on Mount Stephen (Campsite Cliff Shale Member, Burgess Shale Formation), based on a time-averaged assemblage of nearly 10,000 specimens. The taphonomic characteristics--size sorting, resistance to decay, and potential flow alignment--and mode of deposition of this assemblage are compared specifically to those of the nearby and stratigraphically younger Walcott Quarry assemblage. Like other Burgess Shale-type deposits, the Tulip Beds consist of millimeter-laminated, event-derived claystone, but lack the thicker claystone layers and prominent carbonate interbeds that occur in the Walcott Quarry. These differences suggest a depositional environment lower in energy and possibly more distal to the Cathedral Escarpment. Overall, taphonomic analyses suggest no significant decay biases, transport, or sorting of the assemblage, and most specimens, benthic taxa in particular, appear to have been buried close to their living environments. Single bedding planes with large accumulations dominated by a single taxon, e.g., isolated claws of Anomalocaris, suggest short time-averaged assemblages with limited background sedimentation. Overall the Tulip Beds locality is environmentally and taphonomically comparable to the Walcott Quarry and biotic variations between the two sites are likely to be primary in nature, thus paving the way for more detailed paleoecological investigations in the future.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 29
Serial Issue: 6
Title: Taphonomy and depositional setting of the Burgess Shale Tulip Beds, Mount Stephen, British Columbia
Affiliation: University of Toronto, Department of Ecology and Evolutionary Biology, Toronto, ON, Canada
Pages: 309-324
Published: 201406
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 59
Accession Number: 2014-086902
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. strat. col., 4 tables, sketch map
N51°23'60" - N51°23'60", W116°28'60" - W116°28'60"
Secondary Affiliation: Pomona College, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201445
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