👉 Hillsite is a type of rock formation that forms from the accumulation or deposition of loose sediment, such as sand and gravel, over long periods of time. It is formed by erosion and weathering processes, allowing for the continuous accumulation of sediment until it reaches a certain depth and becomes a stable rock. The term "hillsite" refers to the specific type of rock formation that forms in a particular area or region, often associated with a location where there are frequent mountain ranges, valleys,