Figure F7. Sedimentary rock fragments: silt-rich mudstones. A–D. Mudstones (silt-rich). E, F. Muddy sandstone. Large sand-size grain; on right side is a metamorphic rock fragment composed of quartz, feldspar and chlorite. Smaller grains include quartz and feldspar. Left = plane-polarized light, right = cross-polarized light.
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