Kilmersdon Road Quarry () is a 0.43 hectare geological Site of Special Scientific Interest between the village of Haydon and the town of Radstock, Bath and North East Somerset, notified in 1954.
This is a key Lias locality spanning much of the Hettangian, Sinemurian and Pliensbachian stages.English Nature citation sheet for the site (accessed 13 July 2006)
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