Subsurface Mississippian Structure Contour Maps with Color-Coded Producing Intervals, Base of Beech Creek (“Barlow”) and Karnak Member (top of Ste. Genevieve Formation.) Local Beech Creek and Karnak Structure Maps with Color-Coded Oil Producing Zones, by Philip M. Johanek, Bryan G. Huff, Rex Knepp, and others, ISGS; 2009, 2012.
Local area maps (1:36,000 or 1 inch equals 3,000 feet.) The local area maps are on the same grid or index map as the Oil and Gas Development Map Series, generally a 3 Township by 3 Range grid, for the areas where the Beech Creek and Karnak are present and mappable in the subsurface in Illinois. Structure-contours at 20 foot contour interval. Contours completed in 2009 and not updated. Oil and gas wells are shown with status symbols and color-coded producing strata.The oil and gas wells and color coded producing horizons were updated in July, 2012. Maps compiled by ISGS from ISGS Digital Well Database and using earlier versions of hand-contoured structure map series.
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