Historical reference: Do not rely on this information. It is very old. About this collection
Ailsa Craig, a rocky islet in the mouth of the Firth of Clyde, remarkable for the abruptness with which it rises from the sea, its height being 1,139 feet. Geologically it is composed of a jointed grey syenite, and it has a cave on the north side. Vast swarms of sea-birds haunt the spot, and a ruined tower shows trhat it was once occupied by man.