Northeastern Iowa holds a 400,000-year-old time capsule. Rather than vast, flat prairies, this region boasts a rolling landscape of bluffs and ravines spared by the earth-tamping force of the last Ice Age’s glaciers. And nestled in the leaf litter on rubble piles beside the region’s chilly bluffs lives a tightly …
from Gizmodo https://ift.tt/2vHpD23
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