The Quarterly Journal of the Geological Society of London, Volumen 101

anticline Barrow Hill basalt base batholith Bisat bisulcatum boring breccia Carboniferous Limestone Caulfeild cent chlorite Coal Measures contorted bed correlation country rock crinoidal débris deposits dolerite dorsal disc drilled Duke's Wood dykes Eakring east Edale Eumorphoceras evidence exposed exposure fault fauna feet felspar fine-grained Fishguard folds formation fossils fragments Fund Geol Geological geologists Goniatites Goyt Trough granodiorite grey horizon igneous rock inclusions intrusion Kelham Hills locality marine band marls miles Millstone Grit mineral Miocene mudstones normal occur oilfields outcrop overthrusts pegmatite peneplain Permian Phialaspis plagioclase plate Pliocene pococki Prescelly Hills Professor quarry quartz region rhyolites salt salt-breccia sandstone Sarmatoid scarp sedimentary sediments shales shear-planes shearing shelly shows slickensides southern specimens strata stratigraphical structure surface Survey symondsi syncline tectonic thickness thin tuffs unconformity upper ventral disc xenoliths zone