The first European explorers thought they were American Indian burial mounds, but found only dirt and pebbles inside when they sliced one of the mounds in half.
Mima mounds are 6-foot-tall, 30-foot-wide domes of dirt that cover the open prairie on Washington's Puget lowlands. They are so large and uniform, it's hard not to feel they must be man-made. But nobody actually knows who or what made them. They are a scientific mystery.
1 comment(s):
It is so obvious that this is a product of seismic activity. I just don't understand why it is still called a mystery!
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