Porth Nanven has sometimes been referred to as 'Dinosaur Egg Beach' in the media because of a remarkable deposit of ovoid boulders covering the beach and foreshore. These boulders come in all sizes, from hen's egg to a metre or more in length, and have proved so tempting as souvenirs that they are now legally protected by the National Trust which owns the beach.
Many visitors assume that these weirdly shaped boulders are the work of the sea, which they are, but the sea of 120,000 years ago. Sea levels have changed several time since then and are now much lower than they were back then, causing the ancient beach to be suspended in the cliff high above the present level.
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