At Schuylkill Gap in eastern Pennsylvania, cycles composed of (1) a basal erosional surface overlain by a thin coarse-grained deposit, (2) a lower greenish-olive interlaminated sandstone and shale member, and (3) an upper burrow-mottled red argillaceous siltstone member occur through two portions of a thick section of the Clinton Formation. The sediments were deposited in an intertidal zone and are believed to represent alternating deposits of high tidal flats and either tidal creek channels or low tidal flats.

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