The Quarterly Journal of the Geological Society of London, Volumen 65The Society, 1909 Vols. 1-108 include Proceedings of the society (separately paged, beginning with v. 30) |
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Términos y frases comunes
abundant andesitic appears Arenig Bala band beds boulders breccia calcareous Carboniferous cherts chlorite cliffs Climacograptus coarse conglomerate Conway County Clare crystals cwms Deganwy deposits described dykes east erosion evidence exposed exposures fault fault-intrusion fauna feet felsite felspar flags folds fossils Geol Geological Gill glacial glaciers Glen Coe gorge granite graptolites grits gritty ground-mass holotype horizon inches intrusion Journ junction Lapw later lavas limestone lines of growth Llandeilo Lower Loxonema M'Coy margin mass matrix mile mineral Monograptus mountains mudstones nodules normal numerous occur Orthis outcrop phenocrysts Phyllites plagioclase pleuræ Pont Erwyd porphyrite pre-Glacial Prof pygidium pyroxene quarry quartz quartzite rhyolite ridge river rocks Sandstone schists seen shales Shangort side sinuosum slope Snowdon district species specimens strata stream structure thickness Tourmakeady tuffs Upper valley volcanic Wales whorls yards zone