His studies of ice-polished rocks in his Alpine homeland, far outside the range of present-day glaciers, led Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets had existed in now currently temperate areas.
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Ain which great ice sheets had existed in now currently temperate areas
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Bin which great ice sheets existed in what are now temperate areas
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Cwhen great ice sheets existed where there were areas now temperate
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Dwhen great ice sheets had existed in current temperate areas
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Ewhen great ice sheets existed in areas now that are temperate
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