Journal of the Geological Society of Dublin


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Seite 203 - I know, in any part of the Arctic Archipelago, is a species of ribbed Atrypa, which I believe to be identical with the Atrypa fallax, of the Carboniferous Slate of Ireland. These sandstone beds are succeeded by a series of blue limestone beds, containing an abundance of the marine shells commonly found in all parts of the world where the carboniferous deposits are at all developed. The line of junction of these deposits with the Silurians, on which they rest, is NE to ENE (true). Like the former,...
Seite 152 - This progression, by minute steps, in various directions, but always checked and balanced by the necessary conditions, subject to which alone existence can be preserved, may, it is believed, be followed out so as to agree with all the phenomena presented by organized beings, their extinction and succession in past ages, and all the extraordinary modifications of form, instinct, and habits which they exhibit.
Seite 209 - ... limestone, casts of fossil shells abound. Inland of these, the ordinary pale carboniferous sandstone and cherty limestone re-appeared. The fossils are all small, and of only a few varieties, some being ammonites, but the greater part bivalves.
Seite 151 - On the Variation of Organic Beings in a state of Nature ; on the Natural Means of Selection ; on the Comparison of Domestic Races and true Species.
Seite 60 - Fauna of Italy. 3. That the red and fluvio-marine crags, tested by their mammalian Fauna, must be considered as beds of the same geological age. I shall now touch upon some subjects more closely connected with Irish Geology ; and, in the first place, I rejoice to find that Professor Haughton is not relaxing in his inquiries as to the mineral composition of the Irish rocks. He read to us a paper on the Siliceo-felspathic Rocks of the south of Ireland, which affords some remarkable results.
Seite 210 - The discovery of such fossils in situ, in 76° north latitude, is calculated to throw considerable doubt upon the theories of climate which would account for all past changes of temperature by changes in the relative position of land and water on the earth's surface. No attempt, that I am aware of, has ever been made to...
Seite 200 - ... earthy limestone, abounding in fossils, and occasionally into a chalky limestone, of a cream colour, for the most part devoid of fossils. The average dip of the Silurian limestone varies from 0° to 5° NNW, and it forms occasionally high cliffs, and occasionally low flat plains, terraced by the action of the ice as the ground rose from beneath the sea. The general appearance of the rocks is similar to the Dudley limestone, and would strike even an observer who was not a geologist. This resemblance...
Seite 52 - Report of the Proceedings of the Geological and Polytechnic Society of the West Riding of Yorkshire.
Seite 199 - A red granite, graphic texture, composed of quartz and red felspar, coarse-grained. y. Syenite, composed of honey-yellow felspar and hornblende, in very large crystals, the felspar passing into red and pink, and the whole rock mass penetrated by veins of the same material, but fine grained. This variety of igneous rock was met with principally at Pemmican Rock, western inlet of Bellot's Straits.
Seite 224 - First and Second Annual Reports of the Geological Survey of Missouri, by GC Swallow, State Geologist, 448 pages, 17 plates, 18 sections, 26 figures and 5 maps, 8 vo.

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