Classroom morning and hill-based afternoon, looking at how the hills near Cribarth are linked to the Sea, with Alan Bowring of Brecon Beacons National Park Authority. Possible content: Carboniferous Limestone - variety of units within it reflecting changing original marine depositional environments between 360 and 330 million years ago. Subsequent expansion of coastal deltas - the deposits now being known as the Twrch Sandstone ... Read more