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30 feet Allendale field anticline barrels base black shale Carbondale Carbondale formation Carlinville Clay shales coal bed Colchester Colchester and Macomb Colmar field Colmar oil field contains contour line crest deposited depth Devonian drift drilled Dry Dry Dry east elevation erosion favorable feet higher feet thick fold Geological Survey Griggsby Hancock counties Herrin Hoing sand holes horizon Huntsville Illinois River Keokuk lens lenses Litchfield located loess logs Louis limestone Map showing Maquoketa shale McLeansboro miles Mississippian Murphysboro Niagaran northeast northwest Ohio Oil oil and gas oil and salt oil sand oil-bearing outcrops overlying penetrated Pennsylvanian Pennsylvanian series places Plate porous position Pottsville Pottsville formation present probably production region reported Rushville salt water sandy shale Schuyler County sea level second lime Shoal Creek show of oil shown southeast southwest strata stratigraphic Stratigraphy structure surface syncline terrace thin Trenton unconformities vicinity