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Calcite, dolomite, insoluble residue, and clay minerals of lower Salina (A1 and A2) and upper Niagaran rocks of southwestern Ontario and Michigan were analyzed. Analysis of variance, trend surface analysis, and factor analysis were carried out on the above constituents, as well as on color and oil and gas production. Dark units contain more carbonate and calcite than light units. Light units contain more dolomite than dark units. Dark units typically contain a 13.4 A clay, whereas light units more typically contain a 10.8 and 9.4 A clay. Light units are associated with proposed marine outlets from the Salina basin. Light/[dark + light] ratios show very good correlation with reported oil and/or gas production. Dark carbonate units (suggesting a restri ted lagoon) lie behind (east of) the known reef arc. High-dolomite-content light units may be related in origin to a shallow-water, subaerial environment currently termed "supratidal."
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