Industrial mineral site no. 1767, known as "Rocky Bay Quarries" is a site in San Juan County, Washington. This site has been associated with limestone and marble. A notation found in DGER Bulletin 52 on page 99-100 says "The limestone appears to consist of a lenticular bed, bluish gray in color and crystalline in texture, interbedded with argillite", and designates the value as "About 4,500 tons of limestone is supposed to have been removed from these quarries. A small tonnage of limestone is still available, but the limestone dips south under argillite".