Old Slate is a common type of stone, primarily used in construction and decoration. This stone is primarily sedimentary rock, formed by the compression and chemical reactions of limestone, dolomite, and other rocks over millions of years. Old slate comes in a rich variety of colors, ranging from dark gray to light gray, often adorned with beautiful patterns and fossils. In rural areas, old slate is commonly used for building houses and courtyards, carrying the imprints of people's lives and local memories. The natural patina formed by the natural weathering of old slate and the foot traffic of people is a rustic natural beauty that cannot be replicated by modern stone imitations. Laying old slate has become a common ground covering method in recent years for rural revitalization and urbanization construction.