The Journal of Geology, Band 12Thomas Chrowder Chamberlin University of Chicago Press, 1904 Vols. for 1893-1923 includes section: "Reviews." |
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anticline apatite Archæan augite beds biotite channel clay color Creek Cretaceous delta deposits described dikes Dimetrodon dips district drainage drift earth east eastern eclogite elevation erosion esker evidence fayalite feet A. T. feldspar fold formation fossils gabbro garnets Geologist Glacial Lake Champlain glaciers glaucophane gneiss gorge granite gravel plateaus groundmass Higher Glacial Lake hills hornblende Hudson water body Huronian indicate iron kames Lake Champlain lakelets land lime limestone loess lower magma material miles minerals moraine mosasaurs mountain nearly northern observed occur omphacite origin outlet peneplain physiographic plagioclase plain porphyritic portion preglacial present probably pyroxenite quadrangle quartz quartzite region Report retreat ridge River sand sandstone schist sections shale shore side silica slate slope southern specimen Stoughton streams structure surface syncline terraces thickness tion topographic tributary U. S. Geological Survey upper valley
Beliebte Passagen
Seite 616 - The result, therefore, of this physical inquiry is, that we find no vestige of a beginning, — no prospect of an end.
Seite 511 - ... pit craters." The cinder cones are most numerous near the summit of the mountain, and, so far as the writer is aware, the products of all these recent and local outbursts are basaltic in character. The later lavas on the northern slope are olivine-rich plagioclase basalts. 1 Published with the permission of the Director of the United States Geological Survey. Near the northern base of Mount Hualalai is a tuff cone, notably larger than those on the upper slopes of the mountain, and forming a very...
Seite 616 - 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 384 - 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 28 - ... 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 750 - 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 58 - The latter rocks occur entirely inclosed, so far as known, in granites and gneisses, generally considered Laurentian, and have not been found in direct connection with the rocks here described. The fact has been brought out that all of the nickel deposits are either on the basic edge of a great eruptive band, which at the opposite edge becomes a quartz syenite or granite, or in dike-like offshoots, often, however, interrupted by other rocks projecting from the southeastern basic edge of the great...
Seite 358 - ... silver lovingcup, designed especially for the purpose of symbolizing the scientific achievements of the recipient. The cup is a classic Greek vase, sixteen inches in height, and stands on a base of serpentine five inches high. It is adorned with casts taken directly from fossils, with a drainage-map of Iowa, with crossed geological hammers, a microscope, and the more conventional spray of laurel, owl of wisdom and torch of learning, — all in relief. One side bears an appropriate inscription...
Seite 55 - ... 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; 3 that at their borders these syenites pass over...
Seite 176 - ... all trace of their original sedimentary nature, if any. were sediments. These highly crystalline rocks were classed as Laurentian or Huronian and were considered to be much older than the unaltered rocks of the so-called Cambrian areas. More extended and closer study of both the unaltered and crystalline rocks and of their relations to one another has changed the views of the writer ; and he now considers the unaltered, so-called Cambrian rocks to be the equivalents of many of the gneisses and...