Graywacke is a type of sedimentary rock that is characterized by its dark gray color and coarse-grained texture. It is composed of a mixture of different-sized rock fragments, such as sand, silt, and clay, which are held together by a fine-grained matrix.
Conglomerate: A type of sedimentary rock similar to graywacke but with rounded rock fragments instead of angular ones.
Sandstone: Another type of sedimentary rock composed mainly of sand-sized grains.
Shale: A fine-grained sedimentary rock formed from compacted mud or clay particles.
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