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Guide Number 59. Geology of Hadrian's Wall (1997) G.A.L.Johnson. The geology of Hadrian's Wall falls naturally into three sectors: in the East the wall is over Upper Carboniferous Coal Measures and Millstone Grit; the Central Section is underlain by Lower Carboniferous intruded by the Great Whin Sill and in the Western sector the Wall crosses the New Red Sandstone.
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