In Heritage Hall at Deep Portage stands a 25 foot tall fireplace built with 70 tons of granite rocks. Some of these rocks are among the oldest on earth. All were transported to the Deep Portage area by immense continental glaciers up to two miles thick during the Pleistocene Ice Age. Deep Portage's bogs, hills, lakes, and surrounding sandy plain were formed by ice movements and glacial meltwaters during this epoch. A geologist, Art Norton of Warba, Minnesota, has prepared an interpretive brochure which maps and describes the six major rock types displayed in the fireplace. In addition, the gradual progression or metamorphosis of one rock type to another, granite to gneiss, is also illustrated. The self guide is available in the Resources Heritage Center at Deep Portage Conservation Reserve.
Submitted by DPCR on Mon, 03/25/1996 - 12:00am
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