Map Of gypsum deposits in northern Ohio, black squares suggest The placement of deposits, from "Geography of Ohio", 1923 Gypsum is Employed in lots of apps: Salt Flats: Gypsum is a standard element of salt flats, which can be expansive, flat regions with a salt crust on the surface area. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050