The Journal of Geology, Band 12Thomas Chrowder Chamberlin University of Chicago Press, 1904 Vols. for 1893-1923 includes section: "Reviews." |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
anticline apatite appear Archæan beds biotite channel clay color Creek delta deposits described Devonian dikes Dimetrodon dips drainage drift earth east eastern eclogite elevation epidote erosion esker evidence fauna fayalite feet A. T. feldspar fold formation fossils gabbro garnets geologists Glacial Lake Champlain glaciers glaucophane gneiss gorge granite gravel plateaus groundmass Higher Glacial Lake hills hornblende Hudson water body Huronian igneous indicate irregular kames Lake Champlain lakelets land lime limestone loess lower magma material mica miles minerals moraine mountain nearly northern observed occur omphacite origin orthoclase outlet physiographic plagioclase plain porphyritic portion preglacial present probably pyroxenite quadrangle quartz quartzite region retreat ridge River rocks sand sandstone schist schistose sections shale side slate slope southern specimens Stoughton streams structure surface terraces thickness tion topographic tributary U. S. Geological Survey upper valley
Beliebte Passagen
Seite 615 - The result, therefore, of this physical inquiry is, that we find no vestige of a beginning, — no prospect of an end.
Seite 742 - THIS treatise is an attempt to reduce the phenomena of metamorphism to order under the principles of physics and chemistry, or, more simply, under the laws of energy.
Seite 615 - IN what follows, therefore, we are to examine the construction of the present earth, in order to understand the natural operations of time past; to acquire principles, by which we may conclude with regard to the future course of things, or judge of those operations, by which a world, so wisely ordered, goes into decay; and to learn, by what means such a decayed world may be renovated, or the waste of habitable land upon the globe repaired.
Seite 55 - That the Adirondack anorthosite is cut intrusively by an augite syenite, which is therefore younger. 2. That, while the larger part of the augite syenite of the Adirondacks is in such situation with respect to the anorthosite as to render impossible any determinations of relative age, its general character is so uniform throughout that it is exceedingly probable that it is all of the same approximate age and consists of intrusions from the same source.
Seite 521 - I came was that the whole mass of Diamond head had been slowly deposited in comparatively shallow water and gradually elevated without being subjected to notable flexure. The ejection of material at first must have been intermittent, with long quiescent periods, to enable the shore to have been repopulated with mollusks and corals.
Seite 385 - Hog cholera has appeared in some localities in this county, but comparatively small losses have as yet occurred. All kinds of stock seem to be in a thriving condition.
Seite 177 - Labrador peninsula to represent a portion of the unaltered rocks and their associated basic eruptives (traps, trap-ash, &c.,) altered by the irruption of granite and rendered schistose by pressure. The granites which have been classed as typical Laurentian, always cut and alter the bedded rocks wherever seen in direct contact with them and are consequently newer than the latter. The above observed facts extending over large areas of the peninsula...
Seite 29 - ... at the request of Mr. GK Gilbert, a series of composite analyses of sedimentary rocks was made in this laboratory. Many samples were mixed into one uniform sample, from which, by a single analysis, an average composition was determined. The material was selected and the samples were prepared by Mr. Gilbert, assisted by Mr. GW Stose, and the analyses were made by Dr. HN Stokes. The data obtained may be tabulated as follows: A. Composite analysis of 27 Mesozoic and Cenozoic shales.
Seite 747 - They are of sand consolidated to a hard — in places almost quartzitic — sandstone. II. They stand about flush with the water at high tide, while at low tide they are left exposed like long, low, flat-topped walls, with a width of from five meters to one hundred and fifty meters, and a length of from a few paces to several kilometers.
Seite 573 - In plan as in profile, the inset arcs of the amphitheaters were vigorously suggestive of basal sapping and recession. The summit upland — the preglacial upland beyond a doubt — was recognizable only in patches, long and narrow and irregular in plan, detached and variously disposed as to orientation, but always in sharp tabular relief and always scalloped. I likened it then, and by way of illustration I can best do so now, to the irregular remnants of a sheet of dough, on the biscuit board, after...