Conglomerates sort in surroundings which are usually not too far from the source of the sediments and full of energy.It forms in many different environments and settings in which the energy of transport is enough crucial to move large grains. The sediment from which it types is much coarser than other clastic sedimentary rocks except for breccias. The only difference between conglomerates and breccias is the roundness of the grains. In conglomerates, the grains are rounded and usually indicate that they have been transported or worked more than the angular grains found in breccias. Distinguishing between breccias and conglomerates is usually very easy as the grains are mostly large enough to see with the unaided eye. If the rock has a smaller grain size (< 2.0mm) which is almost too small to see, then the rock is sandstone.