sentences:  The two counties of Gibson County and Warrick County, separated by Rector's Base Line, were formed March 9, 1813.Gibson County was organized on April 1, 1813 while Warrick County was organized on April 30, meaning that both territories fell under Gibson County for that nearly two month period.Gibson County occupied everything from the Wabash River and from the White River's extension to the Paoli Base Line down the 2d Principal Meridian to the Rector's Base Line.