Abstract
During the middle Silurian, at about 420 Ma, the Lockport strata (mostly dolostone) formed under peritidal conditions in an arid evaporitic setting. The environment of deposition was that of a shoaling-upward sequence from subtidal to intertidal and, subsequently, a supratidal setting followed by subaerial emergence. Under subaerial conditions now mineral-filled former vugs and cavities, and solution breccias, resulted from dissolution of evaporites by surface and near-surface percolating freshwaters. Vugs, cavities and solution-collapse breccias formed under subaerial conditions, representing an unconformity setting.
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