World Life Or Comparative Geology
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(3) The folds are localized instead of being generally dis- tributed over the surface. (4) The folds extend in long- ranges of determinate direction, instead of being promis- cuously disposed. (5) The newer formations have received more extensive folds than the older, whereas progressive cooling should result in progressively diminishing contrac- tional results. The second, third and fourth objections are considered the most serious.
As to Dr. Pfaff's first objection, I think it loses its force... in view of general considerations heretofore presented. As to the second, we may admit that the whole crust would be subjected to similar action, but we might rea- sonably expect the visible results to be differently devel- oped in formations of different constitution and rigidity, and acted on by different superincumbent pressures. Deep-seated plasticity, for instance, as Heim suggests, may be reasonably conceived a true explanation of discord- ant movements in the upper and the deeper portions of the crust; though the plasticity supposed need not be attrib- uted solely to pressure, but partly to the effect of heat and water in a zone more shallow than that where com- pression results in solidification.
What to read after World Life Or Comparative Geology?
You can find similar books in the "Read Also" column, or choose other free books by Winchell, Alexander, 1824-1891 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(3) The folds are localized instead of being generally dis- tributed over the surface. (4) The folds extend in long- ranges of determinate direction, instead of being promis- cuously disposed. (5) The newer formations have received more extensive folds than the older, whereas progressive cooling should result in progressively diminishing contrac- tional results. The second, third and fourth objections are considered the most serious.
As to Dr. Pfaff's first objection, I think it loses its force... in view of general considerations heretofore presented. As to the second, we may admit that the whole crust would be subjected to similar action, but we might rea- sonably expect the visible results to be differently devel- oped in formations of different constitution and rigidity, and acted on by different superincumbent pressures. Deep-seated plasticity, for instance, as Heim suggests, may be reasonably conceived a true explanation of discord- ant movements in the upper and the deeper portions of the crust; though the plasticity supposed need not be attrib- uted solely to pressure, but partly to the effect of heat and water in a zone more shallow than that where com- pression results in solidification.
What to read after World Life Or Comparative Geology?
You can find similar books in the "Read Also" column, or choose other free books by Winchell, Alexander, 1824-1891 to read onlineMoreLess
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