The Journal of Geology

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Thomas Chrowder Chamberlin
University of Chicago Press, 1910 - Geology
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Page 106 - In North Carolina, Virginia, and Arizona there are trunks of trees preserved some of which are 8 feet in diameter and at least 120 feet long, while hundreds are from 2 to 4 feet in diameter. Many of the ferns (some are tree ferns) are of large size, indicating luxuriant growth, while Equisetum stems 4 to 5 inches in diameter are only approached by a single living South American species.
Page 745 - I may say here, however, that, like the great canons of the Colorado, the broad valleys bounded by high and perpendicular walls belong to a vast system of erosion, and are wholly due to the action of ivater. Probably nowhere in the world has the action of this agent produced results so surprising, both as regards their magnitude and their peculiar character.
Page 215 - MATTHEW, WD A provisional classification of the fresh-water Tertiary of the West.
Page 603 - ... 1 Published by permission of the Director of the US Geological Survey. The writer is indebted to Dr.
Page 487 - Notes on Explosive mine gases and dusts, with special reference to explosions in the Monongah, Darr and Naomi mines, by TE Chamberlin.
Page 730 - Cope's opinion that many of these mammals were ancestral to the modernized mammals lacks direct confirmation at present. Other paleontologists, however, are inclined to connect certain of the creodont families with the modern Carnivora. These and other ancestral connections may be demonstrated in the future.
Page 523 - ... evidently cut parallel to the bedding plane of the rock. The material used in the following experiments was all taken from a single slab of the rock, which was perfectly uniform in character, and the columns employed were in all cases cut out of this slab in a direction perpendicular to the bedding plane. When thin sections are examined under the microscope the rock is found to be so fine in grain that a high power is necessary to resolve it. It is composed of minute calcite grains from 0.02...
Page 714 - The lower fossil-bearing strata occur in two layers, the lowermost of which lies within ten or fifteen feet of the base of the formation. This is succeeded after an interval of about thirty feet by a second stratum in which fossils are found, and this appeared to be by far the richer of the two. Both of these strata are of red clay, and at no place did we find them more than a few feet in thickness. The lower horizon we found exposed in two places, viz. : the head of the Coal Creek or Pina Verta...
Page 487 - A Review of Mining Operations in the State of South Australia during the Half -Year ended June 30, 1909, No.
Page 195 - ... were the consequences not of special conditions but of the general properties of rock, we may make the general statement that tectonic earthquakes are caused by the gradual relative displacement of neighboring regions, which sets up elastic strains so great that the rock is ruptured; and that at the time of the rupture no displacements of large areas take place, but there occurs merely an elastic rebound, to an unstrained position, of the lips of th-e fault extending but a few miles on each side...

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