Stratigraphic unit in the Western Canada Sedimentary Basin
Gog Group Trace fossils in a slab from the Gog Group.
Type Group Sub-units see text Underlies Mount Whyte Formation , Chancellor Group , Snake Indian Formation Overlies Miette Group Thickness up to 2,180 metres (7,150 ft) Primary Quartzose sandstone , quartzite , conglomerate Other Siltstone , mudstone , limestone , dolomite Region Alberta British Columbia Country Canada Named by C.F. Deiss, 1940[ 1]
The Gog Group is a stratigraphic unit in the Western Canada Sedimentary Basin . It is present in the eastern and western main ranges of the Canadian Rockies in Alberta and British Columbia .[ 2] [ 3] type locality at Wonder Pass near Mount Assiniboine .[ 1] [ 4]
Lithology and environment of deposition
The Gog Group consists primarily of thick deposits of cross-bedded quartzose sandstone and quartzite , with minor quartzitic conglomerate and sub-arkosic sandstone. It also includes mudstone , siltstone , limestone and dolomite formations. The Gog sediments are thought to have been deposited in shallow marine environments on the subsiding margin of the North American craton (Laurentia ).[ 2] [ 3] [ 5]
Stratigraphy
Subdivisions
The Gog Group is subdivided into the following formations:
Formation Age Lithology
Maximum
Reference
Hota Formation
late Early Cambrian
arenaceous limestone 244 m (800 ft)
[ 2] [ 4] [ 6]
Mahato Formation
Early Cambrian quartzose sandstone 240 m (790 ft)
[ 2] [ 4] [ 6]
Mural Formation
Early Cambrian limestone , dolomite , shale , quartzose sandstone 545 m (1,790 ft)
[ 2] [ 4] [ 6]
McNaughton Formation
Early Cambrian quartzose sandstone , quartzite , arkosic sandstone , conglomerate 600 m (1,970 ft)
[ 2] [ 4] [ 6]
Jasper Formation
Early Cambrian arkosic sandstone , quartzite , conglomerate , argillite 500 m (1,640 ft)
[ 2] [ 4] [ 6]
Formation Age Lithology
Max.
Reference
Peyto Formation
late Early Cambrian
limestone , dolomite 125 m (410 ft)
[ 2] [ 4] [ 6]
St. Piran Formation
Early Cambrian quartzose sandstone 825 m (2,710 ft)
[ 2] [ 4] [ 6]
Lake Louise Formation
Early Cambrian limestone , dolomite , shale , quartzose sandstone
[ 2] [ 4] [ 6]
Fort Mountain Formation
Early Cambrian quartzose sandstone , quartzite , arkosic sandstone , conglomerate 510 m (1,670 ft)
[ 2] [ 4] [ 6]
Jasper Formation
Early Cambrian arkosic sandstone , quartzite , conglomerate , argillite 500 m (1,640 ft)
[ 2] [ 4] [ 6]
Paleontology
Trace fossils such as Skolithos Cruziana Diplocraterion Chondrites Planolites Rusophycus trilobites of the genus Olenellus Peyto Formation limestones at the top of the Group.[ 2] [ 5] archaeocyathid bioherms have been reported from the base of the Mahato Formation , and archaeocyathids, salterellids , primitive brachiopods and echinoderms have been reported from the Mural Formation .[ 4]
See also
References
^ a b Deiss, C.F. 1940. Lower and Middle Cambrian stratigraphy of southwestern Alberta and southeastern British Columbia. Geological Society of America Bulletin, vol. 57, p. 731-794.
^ a b c d e f g h i j k l m Hein, H. J., and M. E. McMechan (1994). Chapter 6 Proterozoic and Lower Cambrian Strata of the Western Canada Sedimentary Basin Archived 2016-07-01 at the Wayback Machine ; in Geological Atlas of the Western Canada Sedimentary Basin, G.D. Mossop and I. Shetsen (comp.). Alberta, Canada: Canadian Society of Petroleum Geologists and Alberta Research Council.[Last accessed 28 June 2016].
^ a b Desjardins, P.R., Buatois, L.A., Pratt, B.E. and Mágano, M.G. 2010. Stratigraphy and sedimentary environments of the Lower Cambrian Gog Group in the southern Rocky Mountains of western Canada. Bulletin of Canadian Petroleum Geology, vol. 58, p. 403-439.
^ a b c d e f g h i j k l Glass, D.J. (editor) 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba. Canadian Society of Petroleum Geologists, Calgary, 1423 p. on CD-ROM. ISBN 0-920230-23-7 .
^ a b Hein, F.J. and Arnott, R.W. 1983. Precambrian Miette conglomerates, Lower Cambrian Gog quartzites and modern braided outwash deposits, Kicking Horse Pass area. Canadian Society of Petroleum Geologists Field Trip Guidebook, 1983, 46 p.
^ a b c d e f g h i j Alberta Geological Survey, 2013. "Alberta Table of Formations; Alberta Energy Regulator" . Retrieved 2016-06-20 . {{cite web }}: CS1 maint: numeric names: authors list (link )
