Gog Group

The Gog Group is a stratigraphic unit in the Western Canada Sedimentary Basin. It is present in the western main ranges of the Canadian Rockies in Alberta and British Columbia, and in the Cariboo Mountains and in the central Purcell Mountains in southwestern British Columbia. It was named by C.F. Deiss in 1940 for a type locality near Mount Assiniboine.
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).
Stratigraphy.
Subdivisions.
The Gog Group is subdivided into the following formations:
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.