Abstract
ABSTRACT Petrographic and mineralogic characters can be used to define four major units in the Black River Group of southwestern Ontario. The presence of large scale sedimentary structures, extremely high dolomite content, abundance of anhydrite, celestite in insoluble residues, and certain textural features suggest a shallow water environment with high salinity and subaerial exposure of wide areal extent during the deposition of the two lower units. These basal carbonates of the Black River Group are considered to be ancient analogues of the present day supratidal carbonate environments.
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