At first, they looked like muddy chunks of ancient shell. But these 20-million-year-old fossil oysters had been slowly replaced with agate over time, creating hidden patterns inside the stone. When ...
WILDKYLE on MSN
They cut open a giant fossil oyster and found the kind of pattern that stops you cold
At first, it just looks like another rough fossil oyster pulled from an ancient riverbank. Then the saw goes through it, and ...
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