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Siltstone
Sandstone is a clastic (made of particles cemented together) sedimentary rock. In this case the particles are silt. As can be seen in the Grain Size column on page 7 or on the Water Velocity graph on page 6, silt is defined as particles ranging in size from 0.0004 to 0.006 cm. Silt stone is a very fine grain rock .
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