The microscopic investigation of the inclined fore-reef beds of the Silurian Richvalley reef (developed in the Liston Creek formation) reveals that they consist of 5 microfacies. These appear today through the effect of dolomitization as argillaceous dolomites, dolomites, dolomitic calcarenites, and calcarenites; however, they all were originally calcarenites. The statistical investigation of the detrital quartz, the echinoderm fragments, and the general organic frequency allows a bathymetrical classification of the 5 microfacies indicating that each tongue of fore-reef clastics consists of their juxtaposition in concentric belts. Hence, it is possible to reconstruct the fluctuations of the reef-core margins corresponding to the successive tongues.

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