Gypsum Caves: Gypsum Caves, also known as gypsum karst caves, kind with the dissolution of gypsum by groundwater. As a little bit acidic drinking water percolates by way of gypsum-prosperous bedrock, it progressively dissolves the gypsum, making underground voids and passages. Map of gypsum deposits in northern Ohio, black squares https://www.propanraya.com/id/produk/eco-gypsum-ee-4050