A grey pillow basalt with a brown alteration rim recovered by dredging during the KNOX-06-RR research cruise in 2007. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news ...

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The Marin Headlands features “excellent exposures” of pillow basalt, Sloan wrote, which is essentially “ancient ocean crust” composed of basaltic lava flows and so-called pillow lava.