At Llantwit Major’s Cwm Colhuw beach, pale limestone ledges and darker mudstones reveal a fossil-rich Early Jurassic sea. Ammonites and bivalves are the main attractions, often preserved as impressions or shells within the foreshore rocks. The striking cliffs and jointed platforms also make this a rewarding place to see how sedimentary rocks weather and break apart. Jurassic, Cliffs and Foreshore, Rating: ♦♦♦