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Biogenic Sands

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Grains derived from marine organisms. Qochayx Island, Coos County, Oregon

  Biogenic grains in sand include the parts of both marine plants and animals that use calcium carbonate minerals in their bodies. Whole or broken up, their hard body parts contribute to sand. The fragments found in sand reflect the marine diversity of the region. They can include fragments of shells, corals, sea urchin spines and their hard bodies, barnacle plates, bryozoans and more. Some sand samples are completly composed of biogenic grains as in the examples below.

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