Ancient carboniferous limestone landform, known as "karst" terrain, is preserved in fossil form by a series of sandstone pipes filling former solution hollows on the beach platform. More recent glaciation is revealed by scatches caused by rocks in the ice-sheet - visible on recently exposed rock at the base of the soft cliffs which themselves reveal a pattern of glacial  deposition. A fascinating, mulit-layered geological treasure. Access is best from the beach - at low tide!
Anglesey map

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Map reproduced by permission of Ordnance Survey ® on behalf of the Controller of Her Majesty's Stationery Office. © Crown copyright. All rights reserved. License number 100044910.