Interpretations of deep (pre-Cayugan) structure from either shallow structure or seismic information should include an evaluation of the different roles played by the Silurian Cayugan salt beds underlying the central Appalachian basin. Four distinct types of salt involvement are identified in Ohio: thin-skinned thrusting along salt beds (southern Ohio), salt-flowage

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structure (Columbiana County), solution-collapse structure (Ashtabula County), and drape over preexisting structure (Summit and Stark Counties). Explorationists should be aware of these effects to prospect profitably for deep pays in the Appalachian area.

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