During the re-survey of sheet 155 of the Geological Survey map by Mr. C. Fox Strangways, the writer was instructed to study the ancient rocks where they crop up inside the boundaries of the Trias. The ancient rocks of Charnwood Forest appear in isolated spots, sometimes of considerable size, through the Trias of the Midland Plain. The oldest rock in contact with them is the Carboniferous Limestone of Grace Dieu, which is dolomitized. Evidence as to their exact age cannot, therefore, be obtained from superposition.
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