conglomerate
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A conglomerate is a type of rock made up of small rounded pebbles and stones that have been stuck together by a natural cement-like material. Conglomerates are useful to geologists because they provide clues about past environments and how rocks were transported and deposited over time.
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Carmelo Formation (conglomerate) at Point Lobos Nagdong Formation at Sangju Conglomerate (/kənˈɡlɒmərət/) is a sedimentary rock made up of rounded gravel-sized pieces of rock surrounded by finer-grained sediments (such as sand, silt, or clay). The larger fragments within conglomerate are called clasts, while the finer sediment surrounding the clasts is called the matrix. The clasts and matrix are typically cemented by calcium carbonate, iron oxide, silica, or hardened clay.
Conglomerates form when rounded gravels deposited by water or glaciers become solidified and cemented by pressure over time. They can be found in sedimentary rock sequences of all ages but probably make up less than 1 percent by weight of all sedimentary rocks. They are closely related to sandstones in origin, and exhibit many of the same types of sedimentary structures, such as tabular and trough cross-bedding and graded bedding.