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average direction Battery Rock Sandstone Bose of Glen Caseyville Formation Caseyville sediments Chesterian sandstones Chesterian Series clastic confined to erosional contains appreciable sandstone Cove Hill Creek Cross-bedding direction Degonia Sandstone dendritic differential compaction Ē Ē Ģ early Pennsylvanian erosion erosional valleys Evansville Valley figure l l Ģ Ģ Gallatin County Genevieve Limestone geology and cross-bedding Glen Deon Goreville Limestone Hardin County Illinois Basin Indiana indicate a paleoslope Kentucky Kinkaid Formation lateral continuity Lusk cross-bedding Lusk Shale Member Menard Mississippian Ordovician outcrop mapping peneplain Pennsylvanian sand body Pennsylvanian sediments Posey County Potter Pounds Sandstone Members pre-Pennsylvanian geologic map Rock and Pounds Š š shown in figure siltstone Simplified pre-Pennsylvanian geology small shale-filled valley ſº southeastern Illinois southern edge southwestward stratigraphic study area SUB-PENNSYLVANIAN UNCONFORMITY sub-Pennsylvanian valleys subsidence subsurface and outcrop three-mile intervals transport direction valley fill valley system vector mean Wanless