The generally flat-lying terrain around Red Jacket, at an elevation of about 1200 ft ASL, was scraped by the 2 mile thick glaciers and is underlain by the Portage Lake Volcanics, striking to the NE. Low hills that project above are outwash moraines, gravels and sands which were dropped by receding glaciers. Swedetown, Centennial Hill and Tamarack Hill are thus glacial deposits. These deposits are best preserved in flat places where erosion is weaker. There were likely more of these which have been eroded away since the glacial retreat in areas northwest and southeast, where the slopes fall toward the lakeshore.