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acid appears Atrypa Bala band beds boulders Brachiopoda brownstone Calp carbonate Carboniferous Limestone Chiton clay cliffs coal coal-measures coast colour conglomerate county of Dublin crinoid deposited Dingle district drift Dudley Dunquin east escar feet felspar formation fossiliferous fossils Galway GEOL Geological Society geologists Glengarriff Goniatites granite gray Graywacke greenstone Griffith grit Hill igneous inches Ireland Irish iron Island Jukes Kinahan lime Llandilo locality Lough Lower Limestone Lower Silurian Ludlow magnesia mass mica mica slate miles mineral mountain observed occur Old Red Sandstone Orthis PaL Fos paper Phil phosphate Plate Presented Professor Haughton quarry quartz remarkable Royal Salt schist Science shales shell shore side SiL Sys Silica Silurian Silurian rocks Silurian System Society of London species specimens strata Strophomena surface thickness Tirnaskea townland Trinity College Tyrone unconformably Upper Silurian Wenlock zone
Seite 203 - ... undoubtedly the carboniferous limestone type, and that at Byam Martin's Island, where fossils are found in this sandstone, they are allied to Atrypa fallax and other forms characteristic of the lower sandstones of the carboniferous epoch. It is, therefore, highly probable that the coal-beds of Melville Island are very low down in the series, and do not correspond in geological position with the coal-beds of Europe, which rest on the summit of the carboniferous beds. It is interesting to find...
Seite 150 - We believe we have now shown that there is a tendency in nature to the continued progression of certain classes of varieties further and further from the original type — a progression to which there appears no reason to assign any definite limits...
Seite 150 - 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 149 - 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 210 - ... indicate also a climate sufficiently mild to allow of their having grown upon the land where they now occur. Mr. Hopkins, in his anniversary address as President of the Geological Society of London, has published a remarkable geological speculation, which would account for the facts above mentioned.* So far as the evidence of drift boulders is concerned, I have shown that the direction of the currents was from the south ; a fact which falls in with the drift theory, so far as it goes. We cannot,...
Seite 207 - ... 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 206 - I do not believe in the lapse of a long interval of time between the silurian and carboniferous deposits, — in fact, in a Devonian period. 4th. The same blending of corals has been found in Ireland, the Bas Boulonnais, and in Devonshire, where silurian and carboniferous forms are of common occurrence in the same localities.
Seite 221 - Part ii. ; presented by the Society. 'Proceedings of the Literary and Philosophical Society of Liverpool, during the Fifteenth Session, 1860-61,
Seite 248 - The oar yielded one with another three-pound weight of silver out of each tun ; and, besides the lead and silver, the mine produced also some quicksilver, but not any alum, vitriol, or antimony, that he could hear of.