Industrial mineral site no. 500, known as "Ginkgo Petrified Forest State Park" is a site in Kittitas County, Washington. This site has been associated with gem and ornamental stones. A notation found in DGER Bulletin 37 on page 45 says "Opalized logs and log fragments abundant in the basalt and interbasalt sediments", and designates the value as "Currently a state park; hence removal of samples prohibited".
