 Four thousand years ago the sea-level was lower and either side of Battery Rocks, on the beaches at Ponsandane (to the east) and Wherrytown (west), evidence of a ′submerged forest′ can be seen at low tide in the form of several partially fossilised tree trunks.Artefacts dating from the Mesolithic (10,000 to 5,000 BCE) have been found indicating some occupation contemporary with the forest.The submerged forest in the intertidal area between Wherrytown and Long Rock is of national importance and is a Cornwall Geology Site.