image: Internal contact within cone-sheet, north of Bloody Bridge carpark; darker acid porphyry crowded with feldspar phenocrysts (up to 2cm) is invaded by light-coloured and more sparsely porphyritic component which appears to fill the fracture further north.
Internal contact within cone-sheet, north of Bloody Bridge carpark; darker acid porphyry crowded with feldspar phenocrysts (up to 2cm) is invaded by light-coloured and more sparsely porphyritic component which appears to fill the fracture further north.
 
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