Geograph - photograph every grid square

Glacial deposits 1

The hill fort of Dinas Dinlle is situated upon a thick pile of glacial deposits, now much eroded by the sea and part of a long ridge whose remnants are now submerged. The material is not a till, but a moraine, and the contorted nature of the sediments show that it has been pushed along several times by an advancing and retreating ice front. The materials are glacio-fluvial gravels which were discharged by meltwater floods alternating with sandy or clay-rich deposits characteristic of low discharge rates. Ice-marginal features such as this are well-known in areas subject to modern glaciation.