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Conglomerate is a clastic sedimentary rock that forms from the cementing of rounded cobble and pebble sized rock fragments. Conglomerate is formed by river movement or ocean wave action. The cementing agents that fill the spaces to form the solid rock conglomerate are silica, calcite, or iron oxides.
Notice in the photo above the rounded rock particles in the conglomerate. These rounded particles make conglomerate different from breccia.
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