| 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)[1] |
| 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 |
  Ellis Group (Canada) | |
The Ellis Group is a stratigraphical 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.[2]
- ^ Cite error: The named reference
lexiconwas invoked but never defined (see the help page). - ^ Peale, A.C., 1893. The Paleozoic section in the vicinity of Three Forks, Montana. United States Geological Survey, Bulletin 110, p.9-56.