At the other
end of the beach is a small cave, this is an adit. Adits were tunnels
to drain water from mine workings. In the adit walls can be seen
rounded pebbles, this deposit represents a raised beach.
In the past
during warmer times, both the north and south poles were smaller, less ice
there meant there was more water in the seas, hence sea levels were higher. This deposit is an indicator
of a past higher beach level.