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The Mesoproterozoic Belt Supergroup in Glacier and Waterton Lakes national parks, northwestern Montana and southwestern Alberta: Sedimentary facies and syndepositional deformation

By
Brian R. Pratt
Brian R. Pratt
Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
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Published:
January 01, 2017
Publication history
27 February 2017

ABSTRACT

A large portion of the Belt-Purcell Supergroup is well exposed in the vicinity of Glacier and Waterton Lakes national parks of northwestern Montana, USA, and southwestern Alberta, Canada. These strata were deposited in the northeastern part of the Mesoproterozoic Belt Basin. The dramatic rate of subsidence combined with dominantly fine-grained sediment influx produced thick units of broadly uniform lithology, which constitute the spectacular and unusually colorful mountain scenery of this region. Seemingly fairly simple at first glance, in detail these rocks exhibit a great deal of facies heterogeneity and a number of unusual attributes. This has resulted in contrasting and controversial interpretations of sedimentary features, depositional dynamics, sedimentary environments, and consequently the overall understanding of the entire basin. The Belt Basin reveals itself to be a unique setting in many respects, but ideas stemming from these rocks have implications for other strata, not just those of pre-Cambrian age, but for the entire Phanerozoic as well. The Belt Supergroup is therefore a particularly stimulating field-trip destination that challenges textbook interpretations.

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Contents

GSA Field Guide

Geologic Field Trips of the Canadian Rockies: 2017 Meeting of the GSA Rocky Mountain Section

Geological Society of America
Volume
048
ISBN print:
9780813756486
Publication date:
January 01, 2017

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