Unit Name: Corral Creek Formation
Unit Type: Lithostratigraphic
Usage: Currently in use
Age Interval: Hadean ? - Ediacaran ? (4567.17 - 542 ma)
Province/Territory: Alberta; British Columbia
Originator: Walcott, C.D., 1910.
Corral Creek, northeast of Lake Louise, Banff National Park, Alberta.
The base is not exposed and the thickness, therefore unknown. The formation is al least 300 m (984 ft) thick in the type area and 200 m (656 ft) at Castle Mountain, its most easterly exposure (Aitken, 1969). It is known only east of the Continental Divide, from Mount Assiniboine in the south to Mount Hector in the north.
Grey and greenish grey slates and some thin beds and laminae of siltstone, with which is interbedded a variable amount of feldspathic, generally coarse-grained sandstone, grit, and pebble conglomerate. Earlier considered fluvial in origin, the coarse-grained rocks are today generally considered to be deposits mass-emplaced into a deep water setting in which hemipelagic mud was settling and silt was being emplaced as distal turbidites.
In the type area the base is unknown and the formation is conformably overlain by the Hector Formation. The Hector is erosionally bevelled beneath the Lower Cambrian Gog Group eastward and southward so that the Gog comes to rest unconformably on the Corral Creek. For regional correlations, see "Hector Formation". The Corral Creek Formation underlies the Hector Formation and the Hector correlates with the Old Fort Point and Wynd Formations (or upper Miette Group) of the Jasper area (Aitken, 1969). The upper Wynd has yielded Ediacaran fossils (Hofmann et al., 1985). The Miette Group is bevelled by an unconformity at the base of the Gog Group. The Gog yields Lower Cambrian body fossils as old as Nevadella Zone (Fritz and Mountjoy, 1975), and trace fossils attributed to trilobites nearly to its base (Palonen, 1976).
The formation was named and loosely defined by Walcott (1910, 1928). Aitken (1969) provided further data, and correlated the Corral Creek-Hector with the Meadow Creek-Old Fort Point-Wynd succession of the Miette Group at Jasper.
Aitken, 1969; Charlesworth et al., 1967; Fritz and Mountjoy, 1975; Palonen 1976; Walcott, 1910, 1928.
Source: CSPG Lexicon of Canadian Stratigraphy, Volume 4, western Canada, including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba; D.J. Glass (editor)
Contributor: J.D. Aitken
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 29 Apr 2003