The Quarterly Journal of the Geological Society of London, Volumen 86

abundant anal appears band basal base beds Bodfean branches Brook Carboniferous character clay close Collection consist containing continuous corals crystals dark deposits described developed direction district early east Eilean evidence exposed fault feet flow folding foliation forked fossils fragments Geol Geology green grits Group Hill horizon igneous inches indicate intrusion keratophyre later lavas length less Limestone locality Lower major margin massive material Measures median middle mile northern occur origin outcrop pass Phillips PLATE portion present probably Prof quarry reached recorded represented rhyolite river rocks rounded salt sandstone seen septa Series shales shows side similar slates southern species specimens stage structure suggested surface thick thin thrusting tuffs Upper usually valley vein Wales western wide wing yards zone