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Ammonites appear beds bones Boulder-clay Brachiopoda British calcite Cambrian Carboniferous Chalk character clay colour connecting canal containing Crag Cretaceous crystalline crystals deposits described Didymograptus district dorsal Eozoon 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 ice-sheet igneous rocks lake later layer left theca limestone margin mass material microscopic miles minerals Museum observed occur origin Palaeozoic paper pebbles pits plate Pliocene polypary portion posterior present probably Prof Professor pyroxene quartz quartzite Radiolaria referred regarded region rhyolite sand Sandstone schists seen serpentine shales shells sicula side silica Silurian species specimens spine strata structure submergence sun-heat surface temperature Tertiary Tetragraptus theca theory thickness trachyte Upper valley valve zone
Page 192 - 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!
Page 336 - A Catalogue of the Library of the Museum of Practical Geology and Geological Survey.
Page 71 - The Life and Letters of Charles Darwin," edited by his son, Francis Darwin, and will be found on pp.
Page 559 - ... 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 or Primordial Silurian contains neither Paradoxides nor Olenus, nor, indeed, any Trilobites whatever, but only Lmgulidte and Graptolites, yet its stratigraphies!
Page 416 - 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...
Page 340 - Introduction to the Classification of Animals (1869) ; Lay Sermons, Addresses, and Reviews...
Page 12 - 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...
Page 10 - ... 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.
Page 338 - The questions arising out of this topic became the subject of warm controversy at the meeting of the British Association in that, and subsequent years. A summary of the whole discussion was given in the work entitled Evidence as to Man's Place in Nature, 1863, and excited great popular interest both in this country and abroad.