Unit Name: Cariboo Group
Unit Type: Lithostratigraphic
Rank: Group
Status: Undefined
Usage: Currently in use
Age Interval: ? Late Proterozoic - Late Cambrian (900 - 488.3 ma)
Age Justification: Cariboo Group strata range in age from Upper Proterozoic (?) (Hadrynian) to Upper Cambrian. At the base of the group, the Isaac Formation may be correlated with the upper Miette Group, a late Proterozoic unit in the Rocky Mountains. At the top of the succession, the Dome Creek Formation contains fossils documented by Dr. W.H. Fritz of the Geological Survey as Upper Cambrian in age (Campbell et al., 1973).
Province/Territory: British Columbia
Originator: Campbell, 1960.
Distribution:
The Cariboo Group occurs throughout the Fraser Plateau where it extends into the Cariboo Mountains towards the Rocky Mountain Trench (Young, 1978). It attains a maximum thickness of about 17,000 feet (5,182 metres) in the western Cariboo Mountains, and thins to about 12,000 feet (3,658 metres) eastward along the the western rim of the Rocky Mountain Trench (Campbell et al., 1973).
Locality Data:
Thickness(m): Minimum 3658, Maximum 5182.
Lithology:
The Carbioo Group includes such diverse rock types as pebble-conglomerate, feldspathic and quartzose sandstone, variously coloured argillaceous rocks, and many kinds of carbonate rocks (Campbell et al., 1973).
Relationship:
The Cariboo Group is subdivided stratigraphically into seven formations, which include in ascending order the Isaac, Cunningham, Yankee Belle, Yanks Peak, Midas, Mural, and Dome Creek Formations. The entire group was deposited essentially without interruption, except for a local disconformity between the Cunningham and Yankee Belle Formations (Campbell et al., 1973). The Cariboo Group is correlative with strata of the Rocky Mountains ranging from the upper Miette Group to the Tatei-Chetang Formation.
Remark:
* Supercedes Cariboo Schists and Cariboo Series.
References:
Campbell, R.B., 1960. Geology, Quesnel Lake [West Half], Cariboo District, British Columbia; Geological Survey of Canada, Preliminary Map 59-1959.
Campbell, R.B., Mountjoy, E.W., and Young, F.G., 1973. Geology of the McBride map-area, British Columbia (93 H) (Report, 5 figures and Map 1356A); Geological Survey of Canada, Paper 72-35, 104 p. + "A" Series Map 1356A, Geology, McBride, British Columbia, Scale: 1:250 000, NTS 93H.
Source: LEXICON_BC
Contributor: Michael Pashulka
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 22 Apr 2010