Geology walks along the North Cornwall coast

See a Submarine Volcano

If you’re looking for a walk along the North Cornwall coast that takes you past fascinating geological features, you’ve come to the right place.

One of the many highlights of this section is Pentire Head and the Rumps, near Polzeath. Roughly 370 million years ago the area that is now Devon and Cornwall lay under shallow seas, with erupting submarine volcanoes. You can see evidence of this between Pentire Point and the Rumps where you can see what looks like a pile of rock pillows which formed as the lava skinned over as it cooled in contact with the sea. Petrified gas bubbles were trapped inside and these can be seen in some individual rock outcrops.