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Sand Spike Concretion, These strange concretions, called sa…

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These strange concretions, called sand spikes, came from a now-depleted locality near the Mexican-American border close to Mt. Signal, Imperial County, California. The provocative formations of different sizes were discovered in beds of sand, and they all were found pointing to the west!! You could read more here allanmccollum.net/amcimages/sanborn.html

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