The Herald Formation is a stratigraphic unit of Late Ordovician age in the Western Canadian Sedimentary Basin.
Lithology
The Herald Formation is composed of dolomiticlimestone and dolomite, which can be microcrystalline, argillaceous or microlaminated. In the centre of the basin, it is represented by anhydrite. == Distribution ==
Distribution
The Herald Formation reaches a maximum thickness of in the Lake Alma area. == Relationship to other units ==