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Lower to Middle Cambrian of the southern Canadian Rockies

By
Paul A. Johnston
Paul A. Johnston
1
Department of Earth and Environmental Sciences, Mount Royal University, 4825 Mount Royal Gate SW, Calgary, Alberta, Canada T3E 6K6
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Christopher J. Collom
Christopher J. Collom
2
MacCallum Geological Consulting, Calgary, Alberta, Canada
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Patricio Desjardins
Patricio Desjardins
3
Shell Exploration and Production Company, Houston, Texas, USA
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Published:
January 01, 2017
Publication history
07 April 2017

ABSTRACT

Lower to Middle Cambrian strata, well exposed in imbricated westward-dipping thrust sheets of the southern Canadian Rockies, host a range of geologic features from famous fossil lagerstätten to economically important ore deposits. This paper describes six localities in the Front and Central ranges west of Calgary that record tectonic, sedimentologic, and biologic events during deposition of the lower to mid-Sauk Megasequence. At the Mount Yamnuska and Castle Mountain viewpoints, Middle Cambrian platformal carbonate sections are well exposed. These were preceded by thick, siliciclastic-dominated, shallow-marine deposits of the Gog Group, which form a dramatic geologic backdrop to Lake Louise. Farther west, a platform-to-basin facies transition is recorded in the vicinity of Field, British Columbia. Pb-Zn mineralization and dolomitization are evident near or at this facies transition at the Kicking Horse Mine in Yoho National Park, and on Fossil Ridge as seen from the Emerald Lake viewpoint. A hike to the famous Trilobite Beds of Mount Stephen offers opportunity for first-hand examination of the Burgess Shale biota and associated unusual mineralogic and geologic features including anomalously Mg-rich mudstone, carbonate mounds, and apparent syndepositional faulting, dilational cracks, brine seeps, and mud volcanism.

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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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