La Biche Group
The Labiche Formation is a stratigraphical unit of late Albian to Santonian age in the Western Canadian Sedimentary Basin.
| Labiche Formation Stratigraphic range: late Albian to Santonian | |
|---|---|
| Type | Geological formation |
| Underlies | Belly River Formation |
| Overlies | Pelican Formation |
| Thickness | up to 420 metres (1,380 ft)[1] |
| Lithology | |
| Primary | Shale |
| Location | |
| Coordinates | 55.01023°N 112.72600°W |
| Region | WCSB |
| Country | .svg.png){kind=small} |
| Type section | |
| Named for | La Biche River |
| Named by | R.G. McConnell, 1892 |
It takes the name from La Biche River, a tributary of the Athabasca River, and was first described in outcrop in the Athabasca River valley by R.G. McConnell in 1892.[2]
Lithology
The Labiche Formation is composed shale with flakes of coccolithic debris, Inoceramus prisms, pyrite.[1]
Distribution
The Labiche Formation reaches a maximum thickness of 420 metres (1,380 ft) in the sub-surface of northern Alberta.[1]
Relationship to other units
The Labiche Formation is overlain by the Belly River Formation and conformably overlays the Pelican Formation.[1]
It is equivalent to the parts of the Colorado Group in central Alberta and to the sum of Smoky Group, Dunvegan Formation and Shaftesbury Formation in north-western Alberta.
References
- Lexicon of Canadian Geologic Units. "Labiche Formation". Retrieved 2010-01-09.
- McConnell, R.G., 1893. Report on a portion of the district of Athabasca, comprising the country between Peace River and Athabasca River north of Lesser Slave Lake. Geological Survey of Canada, Annual Reptort (new series), 1890-91, v. 5, Part 1, p. 1-67.