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Colorado's Crisscross Dikes & a "Smoking Gun" with David Stig Hansen — Part 3 of 3 | Classics Rotation

In the closing part, David Stig Hansen leaves Africa for Colorado, where he shows the dikes near the Continental Divide and the Spanish Peaks that he calls his "smoking gun" for constructed walls. If you like field-trip-style geology mysteries, roadside rock samples and a researcher naming his own "Stig butt-up" phenomenon, stay for this one.

David finishes in South Africa with channels, crisscrossed plateaus and the symmetrical lines of the Great Escarpment, which he says look vitrified on both sides. In Colorado he points out the dikes near Rand at about 10,000 feet, describes a large one…

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