Ma Butte Formation
The Ma Butte Formation is a stratigraphic unit of Early Cretaceous (Albian) age in the Western Canada Sedimentary Basin. It was named for Ma Butte, a mountain north of Coleman, Alberta, by J.R. McLean in 1980. It is present in the foothills of southwestern Alberta and it contains plant fossils.
| Ma Butte Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Blairmore Group |
| Underlies | Crowsnest Formation |
| Overlies | Beaver Mines Formation |
| Thickness | up to 132 metres (430 ft) |
| Lithology | |
| Primary | Sandstone, siltstone, mudstone |
| Other | Conglomerate, bentonite, tuff |
| Location | |
| Region | Alberta |
| Country | Canada |
| Type section | |
| Named for | Ma Butte |
| Named by | J.R. McLean |
| Year defined | 1980 |
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