its nature in the world, and was intended to promote goodwill between nations and underscore the international nature of protection of wilderness. In terms of local governance, those lands within Waterton Lakes National Park were split between the Municipal District of Kerr No. 39 and the Municipal District of Castle River No. 40 prior to 1944. Following a partial amalgamation of the two municipal districts, remnant unsurveyed lands within the park were incorporated as Improvement District (ID) No. 11 on January 1, 1944. It was renumbered to ID No. 8 on April 1, 1945, and again to ID No. 4 on January 1, 1969. The Waterton-Glacier International was inscribed a UNESCO World Heritage Site in 1995. In 1979, Waterton became Canada's second biosphere reserve and the first Canadian national park to take part in this UNESCO program. Biosphere Reserves are created to achieve a better understanding of the relationship between humans and the natural environment. In September 2017, a large forest fire forced the evacuation of the townsite and park. The fire burned through 200 km2 of the park, destroying the visitor centre, stables and other buildings. Some 80% of hiking trails were affected and several remained closed for the 2018 season. Geology The oldest rocks in the park are marine sediments dating back 1.5 billion years. These rocks are composed of limestone, dolomite and igneous rocks. There are fossilized sea beds as well as salt pseudomorph. There are numerous stromatolite formations that are 1.3 billion years old. Unlike the Canadian Rockies, whose sedimentary strata are more or less inclined, the Waterton sediments are characterized by a single overlap. The Lewis Overthrust allowed sediment Proterozoic to move as a unit, more or less, horizontally on the rocks of the Cretaceous period dating from about 70 million years ago on a remote 100 km south-east of the mountain's present location. The fact that older rocks end up on younger rocks is a rare occurrence in geology. Under the Proterozoic layer, there is a layer dating from the Upper Cretaceous which is mainly composed of schist. Although there are no glaciers left in Waterton, aside from a few expanses of eternal snow, the landscape has been greatly shaped by the Wisconsin glaciation. The park has many glacial troughs, the hanging valleys, the ridge, the cirque, the kame and esker. Since the end of the last ice age, the Cameron and Blakiston rivers