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Shand S James The Lavas of Mauritius
Comparison with Neighbouring Borings
Summary and Conclusions
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acid andesite anticline aplite appear arenaceous Avonian Bala bands Barr Beacon basalts base beds Birkhill Breadstone breccia Bunter Candleston Caninia Carboniferous Limestone chert chlorite Coal Measures coarse colour conglomerate consist contain crinoidal crinoidal limestones crystals deposits described district dolomitic east eastern evidence exposed exposures fault fauna feet felspar fine-grained folding fossils fragments Geol grains granite graptolites grey Hill holotype Hopwas horizon igneous inches inlier intrusion Islay Jersey junction Koninck Lapworth lithology Llanegryn localities Lower Mendips mile Millstone Grit mineral Monograptus mudstones Museum Nechells Nechells Breccia north-east northern occur Old quarry Oolite outcrop pebbles pericline phenocrysts plagioclase porphyritic probably Prof protoconch quartz Quartzite rhyolite ribs sandstone schist seen shales similar Slates south-west species specimens spherulitic strata structure suture syncline thickness thin Tremadoc unconformity Upper valley volcanic rocks Wales whorls yards zone Zygopleura