Stonewall Formation
| Stonewall Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Underlies | Interlake Group |
| Overlies | Stony Mountain Formation |
| Thickness | up to 34 metres (110 ft)[1] |
| Lithology | |
| Primary | dolomite |
| Other | Sandstone, anhydrite |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Region | WCSB Williston Basin |
| Country | Canada |
| Type section | |
| Named for | Stonewall, Manitoba |
| Named by | E.M. Kindle, 1914 |
The Stonewall Formation is a stratigraphic unit of Late Ordovician to Early Silurian age in the Western Canadian Sedimentary Basin.
It takes the name from Stonewall, Manitoba, and was first described in the Stonewall quarry by E.M. Kindle in 1914.[2]
Lithology
[edit | edit source]The Stonewall Formation is composed of finely crystalline dolomite, with a basal argillaceous and sandy dolomite (the Williams Member). Two thin sandstone beds occur in the middle and at the top of the formation. [1] In the central Williston basin, the base is marked by an anhydrite bed.
Distribution
[edit | edit source]The Stonewall Formation occurs at surface in the Manitoba outcrop belt and in the sub-surface in the Williston Basin.[1] It reaches a maximum thickness of 34 metres (110 ft).
Relationship to other units
[edit | edit source]The Stonewall Formation is overlain by the Interlake Group (conformably in the south, disconformably in the north) and sharply overlays the Stony Mountain Formation.[1]
References
[edit | edit source]- Ordovician Alberta
- Ordovician Manitoba
- Ordovician Saskatchewan
- Silurian Alberta
- Silurian Manitoba
- Silurian Saskatchewan
- Western Canadian Sedimentary Basin
- Geologic formations of Manitoba
- Geologic formations of Saskatchewan
- Stonewall, Manitoba
- Ordovician southern paleotropical deposits
- Dolomite formations of Canada
- Sandstone formations of Canada