Gog Group

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.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. It was named by C.F. Deiss in 1940 after Gog Lake near its type locality at Wonder Pass near Mount Assiniboine.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. .

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).Hein, H. J., and M. E. McMechan (1994). Chapter 6 Proterozoic and Lower Cambrian Strata of the Western Canada Sedimentary Basin ; 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].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.

Stratigraphy Subdivisions The Gog Group is subdivided into the following formations:

Jasper area (north) Formation Age Lithology Max.thickness ReferenceHota Formation late Early Cambrian arenaceous limestone Mahato Formation Early Cambrian quartzose sandstone Mural Formation Early Cambrian limestone, dolomite, shale, quartzose sandstone McNaughton Formation Early Cambrian quartzose sandstone, quartzite, arkosic sandstone, conglomerate Jasper Formation Early Cambrian arkosic sandstone, quartzite, conglomerate, argillite

Kicking Horse Pass area (south) Formation Age Lithology Max.thickness ReferencePeyto Formation late Early Cambrian limestone, dolomite St. Piran Formation Early Cambrian quartzose sandstone Lake Louise Formation Early Cambrian limestone, dolomite, shale, quartzose sandstone Fort Mountain Formation Early Cambrian quartzose sandstone, quartzite, arkosic sandstone, conglomerate Jasper Formation Early Cambrian arkosic sandstone, quartzite, conglomerate, argillite

Paleontology Trace fossils such as Skolithos, Cruziana, Diplocraterion, Chondrites, Planolites, Rusophycus and others are abundant in the Gog Group sediments, and Early Cambrian trilobites of the genus Olenellus are found in the Peyto Formation limestones at the top of the Group. Small 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.

Gog Group

Bron en licentie