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Gog Group

Gog Group
Stratigraphic range: Early Cambrian)
Trace fossils in a slab from the Gog Group.
TypeGroup
Sub-unitssee text
UnderliesMount Whyte Formation, Chancellor Group, Snake Indian Formation
OverliesMiette Group
Thicknessup to 2,180 metres (7,150 ft)
Lithology
PrimaryQuartzose sandstone, quartzite, conglomerate
OtherSiltstone, mudstone, limestone, dolomite
Location
Region Alberta  British Columbia
Country Canada
Type section
Named byC.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] It was named by C.F. Deiss in 1940 after Gog Lake near its 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:

Jasper area (north)

Formation Age Lithology Maximum
Thickness		 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]

Kicking Horse Pass area (south)

Formation Age Lithology Max.
Thickness		 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 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.[2][5] 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.[4]

See also

References

  1. ^ 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.
  2. ^ 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].
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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)
Quelle: https://en.wikipedia.org/wiki/Gog_Group