A sedimentary basin is a physiographic feature representing a low-lying area of the Earth's crust where sediments accumulate over vast geological timescales. These basins generally form through differential subsidence, where the rate of sediment deposition exceeds the rate of crustal uplift. Over immense stretches of time, various sources—including weathered continental material, oceanic detritus, and biologically derived remains—deposit layers of sediment that lithify into rock strata. The study of these rock layers, known as stratigraphy, is fundamental to understanding Earth's deep past, providing a record of ancient climates, tectonic movements, and the evolution of life forms. These formations are key areas of scientific study because they often contain fossil evidence and deposits of mineral resources.