Lawrence, Marquette County. September, 1967. Altitude c. 4,000 feet. Three kettles, formerly all containing lakes, are seen in close proximity to each other and show a sequence of aging. The center kettle, at far right, still contains a small lake which is relatively free of aquatic vegetation. The other two, at upper right and lower center, have only small remnants of visible water, surrounded by wetland vegetation. Such plants may include grasses, sedges, cattails, and other non-woody species. Typically, organic matter formed by the partial decay and preservation of these plants form the substratum. Eventually, most of Wisconsin's 10,000 to 15,000 lakes will age and ultimately disappear through similar processes of sedimentation and vegetative succession.