Hawthorn Quarry is a Site of Special Scientific Interest in the Easington district of west County Durham, England. It is a working quarry, currently operated by Tarmac, which is situated just north of the eastern end of Hawthorn Dene SSSI.The site has been identified by the Geological Conservation Review as being of significant national importance for its exposures of high quality Middle Magnesian Limestone, which include reef beds, overlying boulder beds, stromatolites and bedded oolites.
