Short note: Conglomerate

Conglomerate is a coarse clastic (rudaceous) sedimentary rock made of rounded pebbles, cobbles and gravel (>2 mm) cemented in a finer matrix of sand, silt or clay by silica, calcite or iron oxide. The rounded fragments show transport by water. It is bedded and poorly sorted. Strength depends on the cement: siliceous cement is strong, clayey cement is weak. Being porous and weakly cemented in some cases, it can leak and be unstable. It is used as aggregate and in rough masonry, and is common in the Siwalik Zone of Nepal.