Lateral continuity is a geological principle that states layers of sedimentary rock are deposited in continuous sheets over large areas. This means that if you find a layer of rock in one location, it is likely to extend horizontally to other locations, unless interrupted by erosion or other geological processes. This concept is important for understanding the distribution of resources like oil and natural gas, as well as for interpreting the geological history of an area. By recognizing lateral continuity, geologists can make predictions about the presence of similar rock layers and their characteristics across different regions.