div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: J Bunker Iowa Geological Survey and K L Deason Missouri Geological Survey l Bunker B J 1982 Structural contour map on the base src=https:reader031vdocumentssitereader031viewer20220220135b284d0d7f8b9a716c8b490dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv