The Building of the British Isles: A Study in Geographical EvolutionG. Bell, 1888 - 343 pages |
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Page 17
... feet thick , and the base is not there seen , but when they reappear on the west side of the Snowdon range , they are much thinner , and are probably not more than 3,000 feet thick , including the basal conglomerate of Llyn Padarn ...
... feet thick , and the base is not there seen , but when they reappear on the west side of the Snowdon range , they are much thinner , and are probably not more than 3,000 feet thick , including the basal conglomerate of Llyn Padarn ...
Page 18
... thick a mass of rock be accounted for ? There seem to be only three possible ways of meeting the difficulty : - ( 1 ) ... feet high , so that it was not over - topped by the Cambrian Sea till the time of the Lingula Flags . ( 3 ) That the ...
... thick a mass of rock be accounted for ? There seem to be only three possible ways of meeting the difficulty : - ( 1 ) ... feet high , so that it was not over - topped by the Cambrian Sea till the time of the Lingula Flags . ( 3 ) That the ...
Page 19
... feet thick , which is about half their thickness in Merioneth . Whether they thin eastward in the trough between the two principal Archæan tracts is not yet known , but at Trefgarn on the south - east side of the eastern massif no ...
... feet thick , which is about half their thickness in Merioneth . Whether they thin eastward in the trough between the two principal Archæan tracts is not yet known , but at Trefgarn on the south - east side of the eastern massif no ...
Page 20
... thickness is not more than 1,000 feet , and there is no representative of the Tremadoc . A similar change takes place southward ; near St. Davids the Lingula Flags are not more than 2,000 feet thick , and consist largely of sandstones ...
... thickness is not more than 1,000 feet , and there is no representative of the Tremadoc . A similar change takes place southward ; near St. Davids the Lingula Flags are not more than 2,000 feet thick , and consist largely of sandstones ...
Page 21
... feet thick . This Torridon Sandstone is probably of early Cambrian age , and has evidently been formed against an Archæan coast - line . Its composition is thus described by Professor Bonney 1 : " Its coarser basement beds are crowded ...
... feet thick . This Torridon Sandstone is probably of early Cambrian age , and has evidently been formed against an Archæan coast - line . Its composition is thus described by Professor Bonney 1 : " Its coarser basement beds are crowded ...
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The Building of the British Isles: A Study in Geographical Evolution ... Alfred John Jukes-Browne No preview available - 2018 |
Common terms and phrases
Archæan Bagshot Bagshot Beds basin beds beneath Boulder-clay breccia Britain British calcareous Cambrian Carboniferous Limestone Chalk Channel Coal-measures coast coast-line conglomerate contain Crag Cretaceous deposits Devonian district Dyassic east eastern eastward edition elevation England Eocene epoch erosion estuarine evidence existed extended fathoms fauna feet thick formation formed fossils France freshwater Gault geographical Geol Geology Glacial gravels Greensand grits History infer Ireland island Isle Journ Jurassic Keuper lacustrine lake land London Clay Lower marine marls Memoir Miocene north-east northern northward occur ocean Old Red Sandstone older Oligocene Oolite Ordovician Paleozoic pebbles period Plate Pleistocene Pliocene portions Portrait present probably Professor Purbeck Quart region ridge rivers rocks sands Scotland sediment shales shallow shore Silurian southern stones strata submerged subsidence surface thin tion tract Trans Trias Triassic unconformity upheaval Upper valley Vectian vols Wales Wealden western westward Yorkshire
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