Diagram of Nitrate Bed
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The nitrate is found on the east side of a low range of hills from fifteen to ninety miles back from the sea. It is in the form of rocky stratum with layers of salt rock and sand above it, although sometimes it lies on the top of the ground.
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Structural GeologySource
Frank G. Carpenter Carpenter's Geographical Reader: South America (New York, NY: American Book Company, 1915)
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