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Ribbon Chert 7

Franciscan Ribbon Chert is late Mesozoic. It has been interpreted to be a deep sea sediment (based on radiolarian studies) that spans a time period of between 200 mya and 100 mya. It is associated with basalts and graywackes along a spreading center.

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Uploaded on July 27, 2015
Taken on July 3, 2015