div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: RHA1P1 - Minnesota Department of Natural Resources · Minnesota Geological Survey State Map Series S-1 scale Keen KL and Shane LCK 1990 A continuous record of Holocene src=https:reader034vdocumentinreader034viewer20220502115f5d74e5405c767c853d8669html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv