The Silurian Hypothesis
Stuff To Blow Your Mind
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Is There Advanced Technology Under the Water?
The focus is on the period between the emergence of complex life on land in the devonian, 400 million years ago. If it was much more recent, you'd probably get into an area where you'd start to expect to see those kinds of a remnants and artifactsthat we were talking about. The first big one would be looking at the geological footprint of the anthropocene.
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