Map Of gypsum deposits in northern Ohio, black squares point out The placement of deposits, from "Geography of Ohio", 1923 Gypsum is used in a wide variety of apps: Gypsum occurs in in depth beds affiliated with other evaporite minerals (e.g., anhydrite and halite), particularly in Permian and Triassic sedimentary https://www.propanraya.com/id/produk/eco-gypsum-ee-4050