Ellis Group
| Ellis Group | |
|---|---|
| Stratigraphic range: | |
| Type | Geological group |
| Sub-units | Swift, Rierdon, Piper & Sawtooth Formations |
| Underlies | Mannville Group |
| Overlies | Rundle Group & Shaunavon Formation |
| Thickness | up to 150 m (490 ft) |
| Lithology | |
| Primary | Shale, sandstone |
| Other | Siltstone, limestone |
| Location | |
| Coordinates | 48°00′N 108°36′W / 48.0°N 108.6°W |
| Approximate paleocoordinates | 40°54′N 49°12′W / 40.9°N 49.2°W |
| Region | Alberta, Saskatchewan, Montana, Wyoming |
| Country | Canada, United States |
| Extent | WCSB |
| Type section | |
| Named for | Fort Ellis |
| Named by | A.C. Peale |
| Year defined | 1893 |
The Ellis Group is a stratigraphic unit of Bajocian-Oxfordian age in Alberta, Saskatchewan, Montana and Wyoming in the Western Canadian Sedimentary Basin. It takes the name from Fort Ellis, Montana, and was first described in outcrop in the Rocky Creek Canyon by A.C. Peale in 1893.