Moosehorn Lake is termed a “kettle lake”, or a depression in the land formed when partially buried ice blocks from the last glaciation (Wisconsin Glacial Episode, approximately 150,000 years ago) melted and then filled with water.  This particular kettle is rimmed with floating sphagnum moss along the shore.  Although the lake itself only covers 2.8 hectares, the surrounding wetland extends out southwestward for another 110 hectares, creating an oasis for migratory waterfowl as well as excellent moose calving area.