Advanced Text-book of Geology, Descriptive and IndustrialBlackwood, 1859 - 403 pagine |
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abundant accumulations agency argillaceous arrangement aspect augite basalt beds bituminous bones calcareous carbonate carboniferous chalk chemical chiefly clay clay-slate coal coal-measures colour compact composed composition compounds conglomerates corals crust crustacea crystalline deposits depth Devonian distinct districts drift earth elevation encrinites eocene epoch eruptive estuaries existing feet felspar fishes fissures formation forms fossil genera geological geologists globe gneiss granite gravel greenstone groups heat hence hornblende igneous rocks known lakes laminated land lava layers less lime limestone lower magnesian limestone marine marls mass matter metamorphic mica mineral nature numerous occur ocean old red sandstone oolite organic origin paleontologist peculiar period Permian phenomena plants and animals pliocene porphyry present quartz regions remains reptiles rivers rocky sand schists shales shells siliceous Silurian slates species stone strata stratified structure student surface temperature term tertiary texture thickness tion trappean Triassic upper variety vegetable volcanic
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Pagina 113 - Bright ran at one time a great hazard, and suffered considerable pain from accidentally plunging one of his legs into the hot clay. * From whatever spot the sulphur is removed, steam instantly escapes ; and, in many places, the sulphur was so hot that we could scarcely handle it. From the smell, I perceived that the steam was mixed with a small quantity of sulphurated hydrogen gas.
Pagina 321 - ... with beds of oysters, muscles, and other shells adhering to the rocks on which they grew, the fish being all dead, and exhaling most offensive effluvia.