Abstract

The microscopic statistical investigation of the Wabash reef has revealed 5 main microfacies ranging, in decreasing relative depth conditions, from highly dolomitic shales of the country-rock to dolomitic biocalcarenites and bioconstructed dolomitic limestone or dolomites belonging to the reef system. Among the microscopic parameters, the variation of the orientation of siliceous monoaxonic sponge spicules in the shales can be used as a criterion for predicting the position of the reef.

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