Metachert breccia |
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 MetachertGreen metachert breccia. with quartz-filled fractures. Metachert rock like this is common in the lower Franciscan Formation (Jurassic) in the central Coastal California region. This sample is a stream cobble from Tres Pinos Creek area, San Benito County, California. |
| https://gotbooks.miracosta.edu/rocks/metamorphic/24.html | 2/2/2021 |