event, including the Decorah crater in Iowa, the Ames crater in Oklahoma, and the Rock Elm crater in Wisconsin. Provincial park The Slate Islands Provincial Park was established in 1985 to protect the biodiversity and provincially significant elements of the natural and cultural landscape, and to maintain the islands' ecology by controlling development and focusing recreational use. While it is a non-operating park, some facilities are available, such as a dock, warm-up shelter, and five backcountry campsites. Permitted activities include boating, camping, canoeing, fishing, and hiking. It is only accessible via boat or floatplane. References Bibliography Pye, E.G. (1997). Roadside Geology of Ontario: North Shore of Lake Superior, Ontario GEOservices Centre, ROCK ON Series 2. Sharpton, V.L. and Dressler, B.O. 'The Slate Islands Impact Structure: Structural Interpretation and Age Constraints', Lunar and Planetary Science. March 1996: vol. 27 Godwin, L. (February 1996) "Woodland Caribou in Northwestern Ontario - Why they are different...", Northwestern Ontario Boreal Forest Management Technical Note TN-07 External links Aerial exploration of the Slate Islands Impact Crater Impact craters of Ontario Ordovician impact craters Landforms of Thunder Bay District Islands of Lake Superior in Ontario Archipelagoes of Canada