Viaduct Quarry () is a 0.3 hectare geological Site of Special Scientific Interest near Shepton Mallet on the Mendip Hills in Somerset, notified in 1984. This disused quarry is a Geological Conservation Review site identified as the best exposed and thickest section in the Downside Stone, a localised limestone development which accumulated adjacent to the Lower Jurassic Mendip Island. See also Quarries of the Mendip Hills Sources English Nature citation sheet for the site (accessed 9 August 2006) External links English Nature website (SSSI information) Sites of Special Scientific Interest in Somerset Sites of Special Scientific Interest notified in 1984 Geology of Somerset Quarries in the Mendip Hills