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National Geographic : 1977 Aug
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Huge chunks of ice deposited in glacial debris created depressions, many kettle-shaped (facing page). More than 10,000 became lakes, others bogs and swamps. Hundreds remain dry. More lakes were formed as the ice gouged rock basins or dammed ,, streams with debris. ST.CROIXNATIONAL SCENICRIVERWAY Boulders and loose rock embedded in the moving ice scratched bedrock like agiant rasp, leaving clear marks of its passage. Grindingaction of silt particles polished rock surfaces and produced fine "rock flour" that gave a milky cast to streams containing glacial meltwater. rgeon (ay Algoma Lake Michi beach links segments c Trail. anitowoc aukee Ice Age NationalScientificReserve PAINTING BYJAIME OUINTERO RESEARCHBY MELISSAH. FARNUM NATIONALGEOGRAPHICART DIVISION Wisconsin's showcase for its Ice Age legacy W INDING across the state, a hummocky, irregular ridge called a terminal moraine, deposited at the glacier's front, marks much of the Ice Age Trail. When completed, the trail will offer hikers, bicyclists, and cross country skiers a grand tour of glacial features from Sturgeon Bay to the St. Croix River Gorge. IO Citizens are blazing the narrow route across private property and public parks. CANADA Lake Superior wli Lake MICHIGAN Huron Madison Lake Lake Michigan Chicago. 184
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