Puneet Varma (Editor)

Herald Formation

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Type  Geological formation
Country  Canada
Underlies  Stony Mountain Formation
Overlies  Yeoman Formation
Primary  Limestone
Sub-units  Lake Alma Member Coronach Member Redvers Unit
Thickness  up to 38 metres (120 ft)
Named by  Saskatchewan Geological Society, 1958.
Region  Western Canadian Sedimentary Basin

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

Contents

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.

LithologyEdit

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.

DistributionEdit

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

Relationship to other unitsEdit

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.

SubdivisionsEdit

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

  • Lake Alma Member
  • Coronach Member
  • Redvers Unit
  • References

    Herald Formation Wikipedia


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