Framgents of anthracite and limestone dug up by rabbits around the lime kiln above North Haven, Skomer Island.

Lime was important on the island both to be used as mortar for the buildings and to spread on the land as a fertilizer, the volcanic rocks of the Island not giving rise to a naturally fertile soil. Limestone (and coal) would have been imported from the mainland, landed on the beach at North Haven and then moved to the kilns where it would be heated. The intense heat changed the rock, making in brittle and easy to crush to a fine powder ready for use.