DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
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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