The Geological Progress of Twenty-Five Years: President's Address Before the ...
The Geological Progress of Twenty-Five Years: President's Address Before the ...
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We are still in ignorance, however, of the position of the high grounds from which the ice sheets descended." Twenty-five years ago, the attitude of geologists to- wards Permian glaciation was an attitude of scepticism. Even in 1893, Geikie (Text-book, 3d ed.) would say only, of the glacier- like deposits of the English Permian, that "Ramsey had no doubt that they were ice-borne, and consequently that there was a glacial period during the accumulation of the Lower Permian de- posits of the cent...er of England." And the American texts of the time were silent on the subject. Today, however, Geikie's later statement is generally accepted as true. And from Norway and China there comes similar evidence of glaciation which is re- ferred "either to very early Cambrian or to pre-Cambrian time." (Chamberlin and Salisbury, Geology, II, 273.) It yet remains to be seen whether evidence brought- forward for a still earlier Huronian ice age will be generally accepted.
The importance of Carboniferous and Cambrian glaciation Hes not so much in the fact itself, interesting as that may be, as in its bearing on general geological theory.
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To quickly assess the difficulty of the text, read a short excerpt:
We are still in ignorance, however, of the position of the high grounds from which the ice sheets descended." Twenty-five years ago, the attitude of geologists to- wards Permian glaciation was an attitude of scepticism. Even in 1893, Geikie (Text-book, 3d ed.) would say only, of the glacier- like deposits of the English Permian, that "Ramsey had no doubt that they were ice-borne, and consequently that there was a glacial period during the accumulation of the Lower Permian de- posits of the cent...er of England." And the American texts of the time were silent on the subject. Today, however, Geikie's later statement is generally accepted as true. And from Norway and China there comes similar evidence of glaciation which is re- ferred "either to very early Cambrian or to pre-Cambrian time." (Chamberlin and Salisbury, Geology, II, 273.) It yet remains to be seen whether evidence brought- forward for a still earlier Huronian ice age will be generally accepted.
The importance of Carboniferous and Cambrian glaciation Hes not so much in the fact itself, interesting as that may be, as in its bearing on general geological theory.
What to read after The Geological Progress of Twenty-Five Years: President's Address Before the ...?
You can find similar books in the "Read Also" column, or choose other free books by Lewis Gardner Westgate to read onlineMoreLess
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