Viaduct Quarry (grid reference ST621443) 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.

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