notably after a heavy rain. Photographs of the waterfall from the 19th century show a much wider, curtain like character to the falls. When the creek is dry, the older, much-broader ledge can be observed. If there were sufficient interest and funding, some remedial work could theoretically restore the 19th-century appearance of the falls. Due to extremely cold winter temperatures, the falls freeze, creating a dramatic cascade of ice that can last well into the spring. If there is a rain shortage in the autumn, the falls may virtually dry up. In the summer, especially in the rainy months of June and July, the flow can be surprisingly forceful. On June 19, 2014, professional kayaker Hunt Jennings descended the waterfall in a kayak when it was at record height due to several days of heavy rain. The only injury sustained by Jennings was a small cut above his upper lip. A spokesperson for the Minneapolis Park and Recreation Board commented, "We are deeply concerned that this act and subsequent publicity will inspire others to attempt the same feat. The impact of the drop, the large boulders at the base of the Falls, the deep water and fast current could easily injure or kill a kayaker." Park geology Visitors to the park can view the ancient geological history of Minnesota as they walk the path leading from the falls down to the Mississippi River. The uppermost layer of soils and gravels of Minnesota were deposited by the most recent Ice Age, about 10,000 years ago. Four great ice ages have swept away all traces of the more recent Mesozoic and Cenozoic eras in the Twin Cities area, however standing at the upper falls, one is standing directly on the Platteville Limestone Formation laid down during the Ordovician Period of the Paleozoic Era. During the Ordovician Period, about 450 million years ago, the North American continent was situated along the equator and a warm shallow sea covered much of Minnesota. Sea life was abundant and a large number of marine fossils including corals, bryozoans, brachiopods, clams, snails, cephalopods, and trilobites can be found in the limestone and shale sediments at several areas in the Twin Cities and along the Mississippi River in the park.Mossler, J. and Benson, S., 1995, 1999, 2006, Fossil Collecting in the Twin Cities Area. Minnesota at a Glance: Minnesota Geological Survey: University of Minnesota. Descending to the base