Alien technology on Earth!

Wait a minute, that’s not a rock. Photo by Ralph Jewell
From a Geological Timeline Walk at Duke University, developed by Alexander Glass (image from A. Glass).

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Paleontologist, geologist, ecologist, educator. Professor at the University of Illinois at Chicago. Author of Explorers of Deep Time.

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Roy Plotnick

Paleontologist, geologist, ecologist, educator. Professor at the University of Illinois at Chicago. Author of Explorers of Deep Time.