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Chevron folds in ribbon chert of the Marin Headlands, California. Geologist Christie Rowe for scale.
Chevron folds in ribbon chert of the Marin Headlands, California. Geologist Christie Rowe for scale.
Shale matrix mélange with clasts of sandstone and greenstone on Marshall's Beach, San Francisco
Shale matrix mélange with clasts of sandstone and greenstone on Marshall's Beach, San Francisco
Ribbon Chert of the Marin Headlands Terrane, exposed at Marshall's Beach, San Francisco.
Ribbon Chert of the Marin Headlands Terrane, exposed at Marshall's Beach, San Francisco.
Pillow structures preserved in greenschist-facies metamorphosed basalts of the FranciscanComplex, Black Sands Beach, Marin Headlands, California. Fiel
Pillow structures preserved in greenschist-facies metamorphosed basalts of the FranciscanComplex, Black Sands Beach, Marin Headlands, California. Field of view is approximately 2 m wide.
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Eclogite piece from Norway with a garnet (red) and omphacite (greyish-green) groundmass. The sky-blue crystals are kyanite. Minor white quartz is pres
Eclogite piece from Norway with a garnet (red) and omphacite (greyish-green) groundmass. The sky-blue crystals are kyanite. Minor white quartz is present, presumably from the recrystallization of coesite. A few gold-white phengite patches can be seen at the top. A 23 millimetres (0.91 in) coin added for scale.
Photomicrograph of a thin section of eclogite from Turkey. Green omphacite (+ late chlorite) + pink garnet + blue glaucophane + colorless phengite.
Photomicrograph of a thin section of eclogite from Turkey. Green omphacite (+ late chlorite) + pink garnet + blue glaucophane + colorless phengite.
Eclogite
Eclogite
Eclogite from Almenning, Norway. The red-brown mineral is garnet, green omphacite and white quartz.
Eclogite from Almenning, Norway. The red-brown mineral is garnet, green omphacite and white quartz.