Английская Википедия:Herald Formation

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Шаблон:Short description Шаблон:Infobox rockunit

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.[1]

Lithology

The Herald Formation is composed of dolomitic limestone and dolomite, which can be microcrystalline, argillaceous or microlaminated. [2] In the centre of the basin, it is represented by anhydrite.

Distribution

The Herald Formation reaches a maximum thickness of Шаблон:Convert in the Lake Alma area.[2]

Relationship to other units

The Herald Formation is disconformably overlain by the Stony Mountain Formation and conformably overlays the Yeoman Formation.[2]

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:

References

Шаблон:Reflist

Шаблон:Western Canadian Sedimentary Basin

  1. Saskatchewan Geological Society, 1958. Report of the Lower Paleozoic Names and Correlation Committee, Regina.
  2. 2,0 2,1 2,2 Шаблон:Cite web