The rocks range in age from the great folded mountains of the Caledonian chain, 500 - 600 million years old, through the rolling Southern Uplands to the sandstones, coral limestones, coal deposits and extinct volcanoes of the Central Lowlands, some 300 million years old.
(The rocks; range; from the great folded mountains of the Caledonian chain, 500 - 600 million years old; to the sandstones, coral limestones, coal deposits and extinct volcanoes of the Central Lowlands, some 300 million years old)
The rocks
range
from the great folded mountains of the Caledonian chain, 500 - 600 million years old to the sandstones, coral limestones, coal deposits and extinct volcanoes of the Central Lowlands, some 300 million years old