e/Keystone (limestone)

Information
has gloss	eng: Keystone refers to a type of limestone, or coral rag, quarried in the Florida Keys, in particular from Windley Key fossil quarry, which is now a State Park of Florida. The limestone is Pleistocene in age, and the rock primarily consists of scleractinian coral, such as Elkhorn coral and Brain coral.
lexicalization	eng: keystone
instance of	(noun) the earth science that studies fossil organisms and related remains paleontology, fossilology, palaeontology

Media
media:img	Memorial-keystone-1.jpg
media:img	Memorial-keystone-2.jpg