Xenoliths

As Dartmoors plutons pulsed and pushed up and through the country rocks of Devon 270 million years ago, some of these metamorphosed sedimentary layers above ,shattered and sank their altered and fractured boulders into the crystal mush of the rising and cooling magma. As they sink they are generally chemically altered, abraded and rounded off by the intense heat and continued pressure of this new super-hot environment. These resultant buried rocks and boulders are permenantly embedded into the granite framework until exposed later within the walls of a Dartmoor granite tor. These bizarre and erratic stones are more commonly known as Xenoliths.
By definition a Xenoliths, meaning ‘foreign stones’.

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