graywacke - teaching hand/display specimen of an Upper Cretaceous tan graywacke from the Sites Formation

graywacke - teaching hand/display specimen of an Upper Cretaceous tan graywacke from the Sites Formation

Brand: Geological Specimen Supply
9.50 USD In stock Buy at Merchant

Graywacke is a type of sandstone with mixed fragments of rock, quartz, and minerals in a clay matrix, formed in deep sea conditions during the Upper Cretaceous period.

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