Describes a section of Ordovician carbonate rocks (exposed in a railroad cut in Maryland, U.S.A.) whose cyclic alternation of limestone and dolomite was studied with a view to the light it might throw on the origin of dolomite. The petrographic and field evidence suggests a primary origin for the dolomite. The cyclic repetition of dolomite and limestone is considered due to changes in depositional conditions accompanying uplift and subsidence within a Bahama-type sedimentary basin.

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