Cementation.
Conglomerate rock would be formed by the compaction and cementation of rounded pebbles.
Sedimentary rocks are formed when pre-existing rocks, minerals, or organic material undergo weathering, erosion, transportation, and deposition. These sediments then undergo compaction and cementation to form solid rock layers.
Coquina is a sedimentary rock fitting that description.
Organic sedimentary rocks are formed from the accumulation and compression of organic materials, such as plant and animal remains, in bodies of water or on land. Over time, these materials are buried and undergo compaction and cementation processes, which turn them into solid rock. Processes like burial, compaction, and cementation contribute to the formation of organic sedimentary rocks.
Sand compaction and cementation make sandstone, a sedimentary rock formed from compressed sand grains held together by mineral cement.
Metamorphic, igneous, and past sedimentary rocks are turned into sediments by weathering and erosion. Then, the sediment are deposited. Finally, by compaction and/or cementation, a sedimentary rock is formed
Sedimentary rocks, such as sandstone, shale, and limestone, are formed by the compaction and cementation of sediments. These processes involve the pressure from overlying layers compacting sediments together, and minerals precipitating between particles to bind them into a solid rock.
Conglomerate would be formed by the compaction and cementation of particles 1.5 centimeters in diameter. Conglomerate is a coarse-grained sedimentary rock composed of rounded fragments cemented together.
Coal is an organic sedimentary rock, formed from the sedimentary processes of compaction and cementation.
Metamorphic, igneous, and past sedimentary rocks are turned into sediments by weathering and erosion. Then, the sediment are deposited. Finally, by compaction and/or cementation, a sedimentary rock is formed
Sediments must undergo the processes of compaction and cementation to become sedimentary rocks. Compaction occurs when the sediments are squeezed together by the weight of overlying materials, reducing pore spaces. Cementation involves the precipitation of minerals between sediment grains, binding them together to form a solid rock.