Introductory Text-book of GeologyW. Blackwood and Sons, 1869 - 194 strani |
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Zadetki 1–5 od 19
Stran 34
... seam , when a rock of a peculiar character occurs at intervals among a series of strata . For example , the miner speaks of a seam of coal occurring among strata of clay and sandstone , and of a layer of ironstone occurring in a bed ...
... seam , when a rock of a peculiar character occurs at intervals among a series of strata . For example , the miner speaks of a seam of coal occurring among strata of clay and sandstone , and of a layer of ironstone occurring in a bed ...
Stran 35
... seam are thus loosely used by many geologists as synonymous with layer and stratum , bed ought to be applied only to the surface junction of two different strata , and seam to the line of separation between them . Thus the upper surface ...
... seam are thus loosely used by many geologists as synonymous with layer and stratum , bed ought to be applied only to the surface junction of two different strata , and seam to the line of separation between them . Thus the upper surface ...
Stran 40
... seams , bands , flags , slates , and schists , according to their thickness and mode of splitting ; while the unstratified occur as columnar , sub - columnar , tabular , massive , and amorphous . As to the texture or internal structure ...
... seams , bands , flags , slates , and schists , according to their thickness and mode of splitting ; while the unstratified occur as columnar , sub - columnar , tabular , massive , and amorphous . As to the texture or internal structure ...
Stran 88
... seams of coal . Among the flaggy shales of the lower groups , as in Caithness , there occur dark bituminous bands of considerable importance ; but these , it would appear , are the products of animal rather than of vegetable decay . As ...
... seams of coal . Among the flaggy shales of the lower groups , as in Caithness , there occur dark bituminous bands of considerable importance ; but these , it would appear , are the products of animal rather than of vegetable decay . As ...
Stran 96
... seams of coal ( coal being but a mass of mineralised vegetation ) , enters into the composition of all the black bituminous or coaly shales , and which stamps many of the sandstones and limestones with a carbonaceous aspect . As above ...
... seams of coal ( coal being but a mass of mineralised vegetation ) , enters into the composition of all the black bituminous or coaly shales , and which stamps many of the sandstones and limestones with a carbonaceous aspect . As above ...
Pogosti izrazi in povedi
abundant accumulations agency aqueous arrangement ATLAS basalt beds bituminous boulders building-stone calcareous Cambrian carboniferous chalk chemical chiefly clay clay-slate coal coal-measures coloured compact composed composition conglomerates coral-reefs corals cretaceous crust crustacea crystalline deposits districts drift earth Edition encrinites England eocene epoch estuaries existing felspar fishes formation forms fossils frequent fresh-water GEOGRAPHY geologists Geology globe gneiss granite gravel greenstone grits groups igneous rocks interstratified islands lakes laminated land Laurentian lava layers less lias lignite lime limestone lower marine marls masses Mesozoic Metamorphic mica mica-schist mineral mountain limestone numerous occur ocean Old Red Sandstone oolite origin PALEOZOIC peculiar period Permian plants and animals present quartz remains of plants reptiles rivers rocky sand schists Scotland seams seas sedimentary shales shell-fish shells silicious silt Silurian slates slaty species stone strata stratified rocks structure surface termed tertiary TEXT-BOOK texture thick tion trap trappean Triassic upheavals upper vegetable volcanic wealden zoophytes
Priljubljeni odlomki
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Stran 193 - It has not been our good fortune to examine a text-book on science of which we could express an opinion so entirely favourable as we are enabled to do of Mr Page's little work."— Athenceum., ADVANCED TEXT-BOOK OF GEOLOGY, DESCRIPTIVE AND INDUSTRIAL.
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Stran 193 - Of singular merit for its clearness and trustworthy character." — Standard. Third Edition, Enlarged. GEOLOGY FOR GENERAL READERS. A Series of Popular Sketches in Geology and Palaeontology. By the Surne. 6s. "This is one of the best of Mr page's many good books. It is written in a flowing, popular style. Without illustration or any extraneous aid, the narrative must prove attractive to any intelligent reader."— Geological Magazine.
Stran 193 - The divisions of the subject are so clearly defined, the explanations are so lucid, the relations of one portion of the subject to another are so satisfactorily shown, and, above all, the...