Often, but not necessarily, Precambrian. A mineraloid mixture of hydrous aluminum oxides. A collective term used to signify existence of beds or layers, in sedimentary rocks . Sometimes synonymous with bedding plane . Each bedding plane marks termination of one deposit and beginning of another of different character, such as surface separating a sand bed from a shale layer.
Rock tends to separate, or break, readily along bedding planes.
Contrast with material carried in suspension or solution. Belt from which water may be used by plants or withdrawn by soil evaporation . Mass of element remains same, but atomic number increases by 1. B horizon - Soil zone of accumulation below A horizon . Here is deposited some material moved down from A horizon.