The underlying geology of the islands is slate, which was quarried widely until the mid-twentieth century. The Garvellachs lie immediately south west of the islands.
External links
The Scottish Slate Islands Heritage Trust (http://www.slate.org.uk/)
Until then, caribou did well on the SlateIslands due to the lack of natural predators, such as wolves and lynx, and to the lack of deer and moose who compete for food and carry a parasite that are lethal to caribou.
By this theory, which was introduced in the 1970s, the SlateIslands represent only a small part of a much larger impact crater beneath the surface of Lake Superior, representing the bulls eye of the cosmic blow.
The SlateIslands are a tremendous resource for scientists to understand the science of asteroids collisions with plants and to offer clues about the next "Dinosaur Killer" meteor in the earth's future.
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