Unit Name: Daiber Group
Unit Type: Lithostratigraphic
Rank: Group
Status: Formal
Usage: Currently in use
Age Interval: early Middle Triassic (245 - 237 ma)
Province/Territory: Alberta
Originator: Armitage, J.H., 1962.
Type Locality:
Peace River area, Texaco N.F.A. Buick Creek No. 7 well, in 6-26-87-21W6, 41.6 km (26 mi) northwest of Fort St. John, British Columbia, between 1634 and 1981 m (5360 and 6500 ft).
Distribution:
The Diaber Group thins frorn more than 610 m (2000 ft) in the foothills to zero at its easterly subcrop edge, within a distance of about 320 km (200 mi) across northeastern British Columbia and western Alberta.
Lithology:
Predominantly grey siltstones and shales, divided into two lithological units: a louver, argillaceous siltstone unit which grades into grey shale at the base (Montney Formation) and an upper, dark grey, bituminous siltstone and sandstone unit (Doig Formation).
Relationship:
The Diaber Group unconformably overlies Permo-Carboniferous quartzites and cherts, or carbonates of the Mississippian where the Permo-Carboniferous has been eroded. It is overlain by the Halfway Formation, and the contact appears disconformable. At its erosional subcrop limit the Diaber Group may be overlain by Jurassic or Cretaceous beds. It is equivalent to the Toad-Grayling Formation of the foothills of northeastern British Columbia, and to the Phroso, Vega, Whistler and Llama members in the central Rockies.
History:
The name Toad-Graying was used by Hunt and Ratcliffe (1959) for the grey shales and siltstones below the Halfway Formation of the Schooler Creek Group. It was later proposed by Armitage (1962) that that name be changed to Daiber Group, as the Toad-Grayling type section was located 300 miles outside of the Peace River subsurface basin, and the strata contained both the Beyrichites-Gymnotoceras and Nathorstites faunal zones. The name is open mis-spelled "Daiber".
Other Citations:
Ammitage, 1962; A.S.P.G., 1964; Hunt and Radcliffe, 1959; Torrie, 1973.
Source: CSPG Lexicon of Canadian Stratigraphy, Volume 4, western Canada, including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba; D.J. Glass (editor)
Contributor: C. Dawes
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 29 Apr 2003