The American Geologist, Nide 1Newton Horace Winchell Geological Publishing Company, 1888 Includes section "Review of recent geological literature." |
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Sivu 2
... extending its opera- tions into the settled states of the Union , and especially into states in which official geological surveys are in progress , fearing that by the concentration of all authority and control at the national capital ...
... extending its opera- tions into the settled states of the Union , and especially into states in which official geological surveys are in progress , fearing that by the concentration of all authority and control at the national capital ...
Sivu 24
... extend farther northward , as if the gneiss had been subsiding during the deposit of the Animike . The iron , too , is located in these beds , though generally the iron horizon is considered to belong in the lower part of the formation ...
... extend farther northward , as if the gneiss had been subsiding during the deposit of the Animike . The iron , too , is located in these beds , though generally the iron horizon is considered to belong in the lower part of the formation ...
Sivu 29
... extend to a depth of 500 feet . At this depth the last of the borings referable to the Devonian were obtained . The ... extends almost to that depth . This 170 feet of sandstone evidently represents the deposits of the Niagara period ...
... extend to a depth of 500 feet . At this depth the last of the borings referable to the Devonian were obtained . The ... extends almost to that depth . This 170 feet of sandstone evidently represents the deposits of the Niagara period ...
Sivu 48
... extend , presumably , intact under- neath the bed of Douglass Houghton ravine and also underneath the whole of the Keweenaw peninsula . In bulletin No. 23 , however , Messrs . Irving and Chamberlin have abandoned the view of Irving in ...
... extend , presumably , intact under- neath the bed of Douglass Houghton ravine and also underneath the whole of the Keweenaw peninsula . In bulletin No. 23 , however , Messrs . Irving and Chamberlin have abandoned the view of Irving in ...
Sivu 53
... extends unconformably continuously beneath the eastern sandstone to the " south range , " the entire trough in which this sandstone lies having been produced by erosion . To this view the authors object because it necessitates an ...
... extends unconformably continuously beneath the eastern sandstone to the " south range , " the entire trough in which this sandstone lies having been produced by erosion . To this view the authors object because it necessitates an ...
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Yleiset termit ja lausekkeet
abundant American committee AMERICAN GEOLOGIST Animike Archæan augite beds biotite bryozoa Cambrian character chert Cincinnati clay coal color Congress coral Cretaceous crinoids crystalline crystals Darwin deposits described diabase division driftless area dyke eastern sandstone Emmons epidote evidence fact fauna feet feldspar formation fossils gabbro genera genus Geol geological survey geologists grained granites Hall hornblende Huronian Iowa islands James Keweenaw lake layers limestone lower magnetite mass miles Miller minerals Minnesota Missouri mountains natural Nicholson occur Ohio olivine original orthoclase palæontological plagioclase plates porphyries portion Potsdam present primordial probably Prof quartz quartzyte range reef referred region river rocks sandstone schists scientific shales shell shore side Silurian slates species specimens strata stratigraphic structure surface Taconic system theory thickness tion tubes Ulrich unconformably upper valley Walcott York
Suositut otteet
Sivu 254 - ... philosophical, educational, scientific, or literary purposes, or for the encouragement of the fine arts, or for the use or by order of any college, academy, school or seminary of learning in the United States...
Sivu 218 - The interest excited was intense, but the subject was too novel and too ominous for the old school to enter the lists, before armouring. After the meeting it was talked over with bated breath : Lyell's approval, and perhaps in a small way mine, as his lieutenant in the affair, rather overawed the Fellows, who would otherwise have flown out against the doctrine.
Sivu 155 - s lectures on Geology and Zoology, but they were incredibly dull. The sole effect they produced on me was the determination never, as long as I lived, to read a book on geology, or in any way to study the science.
Sivu 253 - ... purposes, or for the encouragement of the fine arts, or for the use or by order of any college, academy, school, or seminary of learning in the United States, subject to such regulations as the Secretary of the Treasury shall prescribe.
Sivu 394 - ... awarded annually for the best publication, exploration, discovery, or research in the sciences of geology and paleontology, or in such particular branches thereof as may be designated. The award, and all matters connected therewith, are to be determined by a committee to be selected in an appropriate manner by the academy. The recognition is not to be confined to American naturalists.
Sivu 156 - Idwal, examining all the rocks with extreme care, as Sedgwick was anxious to find fossils in them; but neither of us saw a trace of the wonderful glacial phenomena all around us: we did not notice the plainly scored rocks, the perched boulders, the lateral and terminal moraines. Yet these phenomena are so conspicuous that, as I declared in a paper published many years afterwards in the Philosophical Magazine, a house burnt down by fire did not tell its story more plainly than did this valley.
Sivu 209 - The atigite occurs both in simple individuals and in polysomatic masses. It exhibits the usual marginal alteration to hornblende and there is besides a certain amount of chlorite. Original magnetite is frequently surrounded by a margin of secondary biotite. Micropegmatitic quartz is abundant. It is often intimately intergrown with the feldspar, and as the latter is much decomposed, would seem to replace it as a partial pseudomorph, but apatite needles of the same...
Sivu 196 - Sea to the 49th parallel, have been ransacked for plants, and when the pateobotanists of the United States shall have succeeded in unravelling the confusion which now exists between their Laramie and the Middle Tertiary, the geologist of the future will be able to restore with much certainty the distribution of the vast forests which in the early Eocene covered the now bare plains of interior America. Further, since the break which in Western Europe separates the flora of the Cretaceous from that...
Sivu 160 - ... by reflecting how much the progress of opinion in Geology had been influenced by the assumption that the analogy was slight in kind, and still more slight in degree, between the causes which produced the former revolutions of the globe, and those now in every-day operation. It appeared clear that the earlier geologists had not only a scanty acquaintance with existing changes, but were singularly unconscious of the amount of their ignorance. With the presumption naturally inspired by this unconsciousness,...
Sivu 160 - ... and subterranean movements. It also endeavours to estimate the aggregate result of ordinary operations multiplied by time, and cherishes a sanguine hope that the resources to be derived from observation and experiment, or from the study of Nature such as she now is, are very far from being exhausted. For this reason...