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Updated: July 28, 2026
Tschudi observed, in the same desert, two species of dunes, fixed and movable, and he ascribes a falciform shape to the movable, a conical to the fixed dunes, or medanos. "The medanos," he observes, "are hillock-like elevations of sand, some having a firm, others a loose base. On this side they are sloping, inside precipitous, and from fifteen to twenty feet high.
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