Both pre-Pennsylvanian and post-Pennsylvanian faulting have been recognized along the north side of the Rattlesnake Ferry fault in southwestern Illinois (St. Clair, 1917; Ekblaw, 1925; Weller and Ekblaw, 1940; Desborough, 1957, 1959, 1960). This area is on the southwestern edge of the Eastern Interior basin (Fig. 1). The term pre-Pennsylvanian is used here to denote that interval of time after deposition of the Kinkaid Limestone (upper Mississippian) and prior to deposition of the Wayside Sandstone (basal Pennsylvanian). No Pennsylvanian strata are known on the south side of the Rattlesnake Ferry fault in...

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