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Herald Formation

Herald Formation
Stratigraphic range: Late Ordovician
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)
Lithology
Primary Limestone, dolomite, anhydrite
Location
Coordinates 49°04′29″N 104°39′08″W / 49.0746°N 104.6521°W / 49.0746; -104.6521 (Herald Formation)Coordinates: 49°04′29″N 104°39′08″W / 49.0746°N 104.6521°W / 49.0746; -104.6521 (Herald Formation)
Region WCSB
Country  Canada
Type section
Named by Saskatchewan Geological Society, 1958.

The Herald Formation is a stratigraphical unit of Late Ordovician age in the Western Canadian Sedimentary Basin.

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.

The Herald Formation is composed of dolomitic limestone and dolomite, which can be microcrystalline, argillaceous or microlaminated. In the centre of the basin, it is represented by anhydrite.

The Herald Formation reaches a maximum thickness of 38 metres (120 ft) in the Lake Alma area.

The Herald Formation is disconformably overlain by the Stony Mountain Formation and conformably overlays the Yeoman Formation.

It can be correlated with the Fort Garry Member of the Red River Formation in Manitoba and in the Williston Basin.

In south-eastern Saskatchewan, the formation is divided in three units, corresponding to three sedimentation cycles:


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