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Herald Formation : ウィキペディア英語版
Herald Formation

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.〔Saskatchewan Geological Society, 1958. Report of the Lower Paleozoic Names and Correlation Committee, Regina.〕
==Lithology==
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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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