Whether mechanical or chemical weathering will be dominant depends on climate . Warm and moist climates promote chemical weathering, while semi-arid or arid climates promote mechanical weathering. Precipitation of minerals within a sedimentary basin by chemical processes , often forming calcite, dolomite, or other salts. The resulting rocks are called chemical sedimentary rocks which are dominated by the carbonate rocks. These rocks are classified on the basis of composition, texture, and the types of particles present Limestone is a rock composed of calcite formed largely by biochemical processes, often including the building of hard parts by marine invertebrate organisms such as corals, clams, oysters.
Many limestones are fossil-bearing.
Dolomite is a rock composed of dolomite, formed mainly by chemical replacement of calcite Three features of sedimentary rocks are important, not only for classification, but also for interpretation. Texture , mainly described by particle size, reflects the energy of the transporting medium and the environment of deposition . Sedimentary structures mainly include the type of bedding which reflects the agent of transport. Cross-bedding can be used to interpret the agent's energy, direction, and environment of deposition. For example, cross-beds inclined in opposite directions one on top of another may indicate deposition by tidal currents.