Herald Formation
Geologic formation in Saskatchewan
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The Herald Formation is a stratigraphic unit of Late Ordovician age in the Western Canadian Sedimentary Basin.
UnderliesStony Mountain Formation
OverliesYeoman Formation
| Herald Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Sub-units | Lake Alma Member Coronach Member Redvers Unit |
| Underlies | Stony Mountain Formation |
| Overlies | Yeoman Formation |
| Thickness | up to 38 metres (120 ft)[1] |
| Lithology | |
| Primary | limestone, dolomite, anhydrite |
| Location | |
| Coordinates | 49.0746°N 104.6521°W |
| Region | WCSB |
| Country | Canada |
| Type section | |
| Named by | Saskatchewan Geological Society, 1958. |
It was defined in well Imperial Herald 1-31-1-20W2M by the Lower Paleozoic Names and Correlations Committee of the Saskatchewan Geological Society in 1958.[2]
Lithology
Distribution
Relationship to other units
The Herald Formation is disconformably overlain by the Stony Mountain Formation and conformably overlays the Yeoman Formation.[1]
It can be correlated with the Fort Garry Member of the Red River Formation in Manitoba and in the Williston Basin.
Subdivisions
In south-eastern Saskatchewan, the formation is divided in three units, corresponding to three sedimentation cycles: