Manual of Geology: Practical and Theoretical, Tom 2

abundance alternating ammonites analogous ancient animals appear argillaceous basalt basin beds bones calcareous calcareous grit carboniferous limestone caverns chalk character clay cliffs coal fields coal measures coal strata coarse coast colour conglomerate containing convulsions cornbrash crystallized deposits Derbyshire Devon dikes diluvial dislocations district Durham earth elevation England Eocene feet thick felspar fissures formation fossils fresh water geological geologists gneiss granite green sand greenstone hills hornblende hyæna igneous Ireland ironstone lacustrine lakes laminated land layers lias lime lower marine marls mass mica millstone grit mineral mountain limestone nearly nodules northern Northumberland observed occur old red old red sandstone oolite organic remains paleozoic pebbles period Permian phenomena plants porphyry quartz range red marl red sandstone remarkable rivers rocks sandy schist seams sediment shale shells Silurian sometimes species stone strata stratified surface syenite tertiary thin tion tracts upper valley veins Wales whole Yorkshire