Graded sandstones occur in the upper Ordovician section of the Girvan district, whose internal structures are generally considered diagnostic of deposition by turbidity currents. Data on thickness and internal structures, petrographic modal analyses, and other evidence suggest that the graded sandstones may have been deposited from waning bottom currents flowing in a southwest direction across the regional southeast paleoslope rather than from gravity-controlled downslope turbidity currents.

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