Uploaded June 2026 | Updated September 2026, 3 weeks ago

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For decades, geologists have pointed to the Navajo Sandstone as proof of an ancient desert — a fossilized sand dune field stretching over 800,000 square miles. But there's a strange problem hiding in the rock that most people overlook. Geologist Dr. Chris Rupe joins Dr. Brian Thomas to share original flume research that tests whether this "desert" story actually holds up.

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