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A conglomerate is a clastic rock that consists of rounded fragments within a finer-grained matrix. This sediment is often deposited in rivers with a steep gradient in which degradation products (erosion) from mountains are transported. If it is not hardened to become a rock, it is called loose gravel. The difference with a breccia is that a breccia is made up of angular chunks, while a conglomerate has rounded clasts. According to the definition the clasts must be larger than 2 millimeters. Any smaller sediment is called sand.
Fine conglomerate. Photography by Erwin Duys
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