Geological Magazine, Volum 2Henry Woodward Cambridge University Press, 1895 |
Altres edicions - Mostra-ho tot
Frases i termes més freqüents
Ammonites appear beds bones Boulder-clay Brachiopoda British calcite Carboniferous Chalk character clay colour connecting canal Crag Cretaceous crystalline deposits described Didymograptus district dorsal Eningen Eozoön evidence fauna feet felspar Foraminifera formation fossils fragments Gault Geikie genera genus Geol Geological Society Geological Survey geologists Glacial period glacier glauconite gneiss grains granite Graptolites gravel heat Ice Age igneous rocks lake later layer left theca limestone Lower Greensand margin mass material metamorphism microscopic miles minerals Museum observed occur Oolite origin paper pebbles pits plate Pliocene polypary portion posterior present probably Prof Professor pyroxene quartz quartzite Radiolarian referred regarded rhyolite sand Sandstone schists seen serpentine shales shells sicula side Silurian species specimens spherulites spine strata structure submergence sun-heat surface temperature Tertiary Tetragraptus theca thecæ theory thickness trachyte Upper valley valve volcanic zone
Passatges populars
Pàgina 196 - His life was gentle, and the elements So mix'd in him that Nature might stand up And say to all the world, 'This was a man!
Pàgina 307 - BY GRENVILLE AJ COLE, MRIA, FGS, Professor of Geology in the Royal College of Science for Ireland, and Examiner in the University of London.
Pàgina 338 - A Catalogue of the Library of the Museum of Practical Geology and Geological Survey,
Pàgina 75 - The Life and Letters of Charles Darwin," edited by his son, Francis Darwin, and will be found on pp.
Pàgina 563 - ... wide. The country occupied by these strata is a nearly uniform plain covered by glacial deposits, but sections are presented by the sea-cliffs, which are from 90 to 150 feet high. The strata consist mainly of marls and limestones, arenaceous deposits being rare, and they form a continuous series from the base of the Cambrian to the top of the Silurian, the whole of these strata being in conformable succession and unconformably overlain by the Devonian. Although the representative of the Cambrian...
Pàgina 423 - ... about four feet in diameter, but without touching the sides of the pool. The stem was about a foot in diameter. I leaped out on this table, and found that it not only sustained my weight. but that the elasticity of the stem enabled me to rock it from side to side. Pieces torn from the edges of this table sank readily, showing that it had been raised by pressure, and not by its buoyancy.
Pàgina 420 - I could recover from my surprise, so as to investigate it minutely. The surface of the lake is of the colour of 'ashes, and at this season was not polished or smooth so as to be slippery ; the hardness or consistence was such as to bear any weight ; and it was not adhesive, though it partially received the impression of the foot ; it bore us without any tremulous motion whatever, and several head of cattle were browsing on it in perfect security. In the dry season, however, the surface is much more...
Pàgina 12 - ... of the sun's rays during summer, due to his nearness at that season, would, in the first place, tend to produce an increased amount of evaporation. But the presence of snowclad mountains and an icy sea would chill the atmosphere and condense the vapour into thick fogs. The thick fogs and cloudy sky would effectually prevent the sun's rays from reaching the earth, and the snow, in consequence, would remain unmelted during the entire summer.
Pàgina 384 - He was elected President of the Royal Geological Society of Ireland in 1882. He was appointed Clerk in the Receiver Master's Office, Dublin, 1860-64; and joined the Staff of the Geological Survey of India in 1864, and served till 1881. On his return to Ireland he was appointed Professor of Geology and Mineralogy in the University of Dublin, and held office from 1881 to 1883. when he became Director of the Science and Art Museum in Dublin, which office he held until his death. Dr. Bull was also Honorary...
Pàgina 14 - Its thick armour of ice cracked with a loud noise like the rattling of thunder, every twenty-four hours it was lifted up a fathom above its former level, broken up, first into ice floes and then into pack ice, and marched down stream at. least a hundred miles. Even at this great speed it was more than a fortnight before the last straggling ice-blocks passed our post of observation on the Arctic Circle, but during that time the river had risen 70 feet above its winter level, although it was three...