British GEOLOGICAL MAP OF THE UK Geological Survey (The
GEOLOGICAL MAP OF THE UK SEDIMENTARY ROCKS IGNEOUS ROCKS METAMORPHIC ROCKS TERTIARY (sanstone (sarsen)) TRIASSIC (sandstone (red and white) PERMIAN (sandstone (red) and dolomitic limestones) DEVONIAN (OLD RED SANDSTONE) (sandstonepurple, red and green) PRECAMBRIAN (gneiss, schist, marble)