Page:Cornwall; Cambridge county geographies.djvu/182

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f 15' GEOLOGICAL MAP OF CORNWALL O 24 6 a J-O 12 ^ RooAv -^ Blown Sand. Alluvium. | | Pliocene. 3 Culm Measures. Ei;^ Devonian. ~~] Loiver Palaeozoic. | Pre Cambrian. j | Serpentine. l^g| Basalts. 9 Granite. The- Ccartbridg& University fr&