Definition: The term "xerocline" is often used in geology to describe a line of rocks that separates two types of soil, which are typically called clays and sands. These lines are very common in regions where there is little rainfall or precipitation, and they can be found on the surface of the Earth's surface. The xeric climate type is characterized by low levels of precipitation, and this means that the soil is often dry and sandy, with limited access to water for plant growth.