Fort St. John Group
The Fort St. John Group is a stratigraphic unit of Lower Cretaceous age in the Western Canada Sedimentary Basin. It takes the name from the city of Fort St. John, British Columbia and was first defined by George Mercer Dawson in 1881.
| Fort St. John Group | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Sub-units | Cruiser Formation, Goodrich Formation, Hasler Formation, Gates Formation, Moosebar Formation, Shaftesbury Formation, Peace River Formation, Spirit River Formation, Bluesky Formation, Sully Formation, Sikanni Formation, Lepine Formation, Scatter Formation, Garbutt Formation, Buckinghorse Formation |
| Underlies | Dunvegan Formation |
| Overlies | Bullhead Group |
| Thickness | up to 2,000 metres (6,560 ft) |
| Lithology | |
| Primary | Shale |
| Other | Sandstone, siltstone and conglomerates |
| Location | |
| Region | Northeast British Columbia Northwest Alberta Southern Yukon Southern Northwest Territories |
| Country | Canada |
| Type section | |
| Named for | Fort St. John |
| Named by | George Mercer Dawson, 1881 |
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