👉 Cobstone is a type of building material commonly used in the United States and Canada. It is made from crushed aggregate stone, which is typically sourced from quarries or pits located near mountain ranges. The stones are mixed with sand and gravel to form a hard, compacted surface that can be used as a base for foundations or walls. Cobstones are typically found in areas where there is an abundance of sedimentary rock and where the ground has been eroded by natural processes such as erosion