Geological Magazine, 9. kötet

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Henry Woodward
Cambridge University Press, 1872
 

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77. oldal - ... series, and are intimately associated with beds of iron ore, generally a slaty hematite, but occasionally magnetite. Chrome, titanium, nickel, copper, antimony, and gold are frequently met with in this series. The gneisses often pass into schistose micaceous quartzites, and the argillites, which abound, frequently assume a soft, unctuous character, which has acquired for them the name of talcose or 6 ADDRESS OF EX-PRESIDENT HUNT.
88. oldal - Mr. D. Forbes stated that in 1859 he had placed in his hands some specimens of granite from the district the discovery of tin in which was announced by Mr. Stephen, and that he found them to be perfectly identical with the stanniferous granites of Cornwall, Spain, Portugal, Bolivia, Peru, and Malacca, which he had also examined. These granites were all composed of white orthoclase, felspar, colourless or black Muscovite mica and quartz. He was not aware that tinstone (cassiterite or oxide of tin)...
371. oldal - Oreston, tends to the conclusion that some of the caves in the south of England contain a fauna that was living before the late Pleistocene age. The whole assemblage of middle Pleistocene animals evinces a less severe climate than in the late Pleistocene times. The fossil bones from the Forest-bed of Norfolk and Suffolk show that in the early Pleistocene mammalia there was a great mixture of Pleistocene and Pliocene species. It is probable also that the period was one of long duration ; for in it...
184. oldal - Although with a firstrate microscope, having an achromatic condenser, the structure of such crystals and sections of rocks and minerals as I have prepared for myself with very great care can be seen by good day-light as distinctly as if visible to the naked eye, still some geologists, only accustomed to examine large masses in the field, may perhaps be disposed to question the value of the facts I have described, and to think the objects so minute as to be quite beneath their notice, and that all...
67. oldal - There was not the stern beauty of Alpine scenery, and still less the fair variety of hill and dale, forest and glade, which makes the charm of a European landscape. There was nothing to catch or detain the lingering eye, which wandered on, without a check, over endless lines of round backed rocks, whose sides were rent into indescribably eccentric forms.
77. oldal - New Hampshire, and that associated with cyanite in Cornwall, Conn. To this third series of crystalline schists belong the concretionary granitic veins abounding in beryl, tourmaline, and lepidolite, and occasionally containing tinstone and columbite.
74. oldal - ... of the knives (one of which was on the table), and he was left to tell his story without interruption or help. He said it was not English or Danish, but Esquimaux iron ; that it was got from two large stones on a hill near a part of the coast which we had lately passed, and which was now in sight ; the stones were very hard ; that small pieces were knocked off from them, and beaten flat between other stones. He repeated this account two or three times, so that no doubt remained of his meaning....
491. oldal - The polar ice which at the present day covers the miserable regions of Spitzbergen, Greenland and Siberia, extended far into the temperate zones of both hemispheres, leaving probably but a broader or narrower belt around the equator, upon which there were constantly developed aqueous vapours, which again condensed at the poles...
78. oldal - ... correspond with the newer gneissic series of our Appalachian region. There exists in the Highlands of Scotland a great volume of fine-grained, thin-bedded micaschists, with andalusite, staurolite, and cyanite, which are met with in Argyleshire, Aberdeenshire, Banffshire, and the Shetland Isles. Rocks, regarded by Harkness as identical with these of the Scottish Highlands, also occur in Donegal and Mayo, in Ireland.
134. oldal - In this paper the author indicated the characters of certain fossils from the Yellow Sandstone of the South of Ireland, referred by him to the above genera, and mentioned in his paper " On the Carboniferous Flora of Bear Island," read before the Society on November 9th, 1870 (see QJGS, vol.

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