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abundant Ahmad algal alluvium altered amphibole amphibolites Attock Attock Slate Attock-Cherat Range bands biotite Bull calcareous Carboniferous Cherat Cherat Range chlorite colour composed correlated Cretaceous crinoidal Darwazai deposits Devonian diorites dolerite dolomitic epidote exposed feet thick feldspar fossils fractures garnet Geol geology Gilgit Agency gneisses grains granitic green grey Hazara District Himalayan Hissartang hornblende Ibid igneous India Indus River intrusions Jamrud Jour Khan Khattak Khewra Formation Khwar Khyber Agency Kohat Kohistan Landikotal Slate limestone lithological Lower Swat Manki Slate Mansehra Masjid Formation metamorphism metasedimentary miles minerals minor muscovite nala norites northern Nowshera occur outcrops overlying Palaeozoic Panjab Univ pegmatites peridotites Peshawar phyllites plagioclase pyroxene quartz quartzite reef region Rehman rocks Salt Range sandstone schists sedimentary Shagai Shagai Limestone Shah Dheri shale Silurian Siluro-Devonian slaty shale Stauffer stratigraphic structure Surv Swat River Tertiary Thin Section ultramafic veins weathered West Pakistan western