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abundant acid Ammonites bands basement beds basin beach bottom Bovey Bovey beds breccias Bristol Channel calcareous Carboniferous Cenomanian Chalk changes chert clay cliffs coast colour contain corals crystals Culm Dartmoor deep deposits Devonian Devonian rocks Devonshire district earth movements east eastern eastwards Eocene erosion eruptions evidence Exeter Exmoor feet finer flints flowed folds formed fossils fragments further Gault clay granite gravels Greensand grey grits Haldon Hercynian hills Hooken Ilfracombe Keuper lake land lava layers Lias Liassic lignites lower Lyme Regis magma marls material miles minerals mountain North northern Old Red Sandstone Ordovician pebbles Permian places present probably quartz radiolarian reached red rocks ridge rivers round sands scenery seen shales shallow shells shore Silurian similar slates slopes South Devon southern stone strata streams structure suppose surface Teign thickness thin traced upheaval upper valleys volcanic rocks western westwards whole zone
Page 77 - ... the fashion in mathematics to preface the proof of any proposition by a concise statement of the theorem which will be shown to be correct. We shall follow this method here, and as we go on shall consider the main objections and rival explanations. We shall attempt, then, to show that the granite mass of Dartmoor is really the solidified upper part of the cooled lava reservoir from which the Carboniferous and Post-Carboniferous volcanoes of Devon were fed.
Page 94 - ... left. However this may be, it is clear that the absence of recognizable pipes is no contradiction to the proposition we set out to prove, and the supposed absence of the acid eruptive rocks is a false premise. On the other hand we have a general accumulation of evidence all tending to justify the view that Dartmoor is, in fact, the upper part of the cooled lava reservoir which fed our Devonshire volcanoes, that it rose to its present place in consequence of the Post Carboniferous earth movements,...
Page 64 - ... of the manifestations of volcanic activity which seem to be the invariable accompaniments of all great earth movements, and which were so intense in Devon that they have left as large a mark on the present scenery of the county as anything we have described. It will be shown in the next chapter that the Dartmoor dome must have been more or less covered with volcanic products, either arranged as Mr. Worth has suggested* in a great composite volcano, or in a number of smaller cones and craters...
Page 168 - Bagshot of Dorset is most striking. Still, one cannot, say that the botanical evidence is conclusive, for the species are few and greatly need re-examination.