Microfolds in graphite schist. Light micrograph of banded layers of metamorphic rock. The convoluted layers formed when sediment such as quartz,organic matter and clay were laid down over a period of time,for instance on a lake bed. The layers were then deformed by geological processes such as uplifting. Compression of the rock converted the minerals into carbon-rich quartzite and schist | |
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Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 3732 px × 4710 px |
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