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abundant American appear augite base beds called character closely coal color committee contains continued coral crystals deposits described developed diabase division dyke Emmons evidence examination existence extends fact fauna feet feldspar formation fossils geological geologists geyserite give given grained granites Hall interesting Iowa islands known lake latter layers least less limestone localities lower mass material mentioned Michigan miles minerals natural nearly notes observed occur original pass porphyries portion position present probably Prof quartz question range recent reef referred regarded region relations represented river rocks sandstone seems seen shales side Silurian similar slates species specimens strata structure surface survey Taconic term theory thickness third tion Ulrich University upper whole York
Сторінка 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...
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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...
Сторінка 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...
Сторінка 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,...
Сторінка 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...