Both Pre-Pennsylvanian and post-Pennsylvanian faulting have been recognized along the N. side of the Rattlesnake Ferry fault in southwestern Illinois. Minor faults which displace Chester strata and are overlain by essentially flat Caseyville beds are considered to be of pre-Pennsylvanian age and give rise to locally angular unconformity between Mississippian and Pennsylvanian strata. Regional transport direction of lower Pennsylvanian sediments in the Eastern Interior Basin, based on cross-bedding studies, was to the SW. On the N. side of the Rattlesnake Ferry fault the transport direction was to the SE., parallel to the strike of the fault, and suggesting that the S., upthrown, side of the fault acted as a locally prominent barrier.

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