Map Of gypsum deposits in northern Ohio, black squares show The situation of deposits, from "Geography of Ohio", 1923 Gypsum is Utilized in a wide variety of applications: Gypsum takes place in extensive beds affiliated with other evaporite minerals (e.g., anhydrite and halite), especially in Permian and Triassic sedimentary formations; https://www.propanraya.com/id/produk/eco-gypsum-ee-4050