Type Geological formation Country Canada Named for Fort Ellis Primary Slate, Sandstone | Other Siltstone, limestone Named by A.C. Peale, 1893 Underlies Mannville Group | |
Sub-units Swift Formation
Rierdon Formation
Sawtooth Formation Thickness up to 150 metres (490 ft) Region Western Canadian Sedimentary Basin Overlies Rundle Group, Shaunavon Formation | ||
The Ellis Group is a stratigraphical unit of Bajocian-Oxfordian age in the Western Canadian Sedimentary Basin.
Contents
- David ellis group replaceable
- Lithology
- Hydrocarbon production
- Distribution
- Subdivisions
- Relationship to other units
- References
It takes the name from Fort Ellis, Montana, and was first described in outcrop in the Rocky Creek Canyon by .C. Peale in 1893.
David ellis group replaceable
Lithology
The Ellis Group is composed of shale and sandstones deposited in marine and transitional environment.
Hydrocarbon production
Oil is produced from the Sawtooth Formation in south-eastern Alberta.
Distribution
The Ellis Group Lateral occurs in the sub-surface in southern Alberta and northern and central Montana. It is typically 80 metres (260 ft), but thickens on either side of the Sweetgrass Arch and reaches up to 150 metres (490 ft) in south-eastern Alberta.
Subdivisions
The Ellis Group includes the following formations, from top to bottom:
Relationship to other units
The Ellis Group is unconformably overlain by the shale and sandstone of the Mannville Group and rests on the carbonates of the Rundle Group. It grades westwards to the Fernie Group shale, and eastwards to shale, sandstones and limestone of the Vanguard Formation and Shaunavon Formation.