Category: Science - Earth/Agricultural/Farming
During the last twenty years much has been written about the "pre-Cambrian" rocks of the British Isles. Unfortunately when attention began to be sedulously given to the study of these ancient formations, the problems of metamorphism were still a hundred fold more obscure than...
Yet is there really nothing in it all, in the theories, the observations, the collections and the books? Do I speak too positively in condemnation of the results of years of ear...
5. Part 5Whenever a prominence of rock is overridden and enveloped by a glacier of the free-moving continental type, one of two things takes place; either that part of the ice which pass...
3. Part 3It thus appears that here as well as upon the river front, the works of art were confined to local deposits, limited horizontally but not vertically, and a strong presumption is...
8. Part 8(10) _The Superposition of Beds of Till of Different Physical Constitution._ After the retreat of an ice-sheet, the surface of the country thus discovered would be largely mantl...
2. Part 2A glance at a geological map of the British Isles will show that the metamorphic rocks of the south-western Highlands of Scotland are prolonged into the north of Ireland, where...
6. Part 6The tracts therefore present these four salient characteristics: (1) the boulders are derived from distant crystalline terranes (400 to 500 miles) and are essentially uncommingl...
7. Part 7(4) _Beds of Marine and Lacustrine Origin._ If between beds of glacial drift there be found beds of lacustrine or of marine origin, such beds would indicate a recession of the i...
9. Part 93. The subsidence which marked the close of the second interglacial interval, marked likewise the inauguration of the third glacial epoch. Its work is represented in Britain by...
10. Part 10Upham maintains that the whole of North America north of the Gulf of Mexico stood at least three thousand feet higher at the beginning of the glacial epoch than at present. Fior...
1. Part 1During the last twenty years much has been written about the "pre-Cambrian" rocks of the British Isles. Unfortunately when attention began to be sedulously given to the study of...
11. Part 11--Notes from the Literature on the Geology of Egypt, and Examination of the Syenitic Granite of the Obelisk which Lieut. Comd'r Gorringe, U. S. N., brought to New York. 27 pp.,...