GEORGE BERNARD / SCIENCE PHOTO LIBRARY GEORGE BERNARD / SCIENCE PHOTO LIBRARY
Tertiary volcanic intrusion called a dyke. A dyke is a sheet of rock, usually igneous rock, which cuts across the bedding or structural planes of the host rock. Igneous rock is formed when magma or molten fluid below the Earth's crust intrudes (is injected) into the earth's crust and crystallizes to a solid. Often this magma reaches the surface as a volcanic eruption. An igneous dyke normally intrudes in a more or less vertical position and some dykes of this nature extend for considerable distances. Photographed in Scotland.
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