Wat mensen zeggen - Een review schrijven
We hebben geen reviews gevonden op de gebruikelijke plaatsen.
Overige edities - Alles weergeven
The Glacialists' Magazine: A Monthly Magazine of Glacial Geology, Volumes 3-4
Volledige weergave - 1895
action American appears Arctic Association basin beds Boulder Clay boulders British Brompton Road cause changes clay climate coast conclusion containing covered currents deposits described direction district drift east elevation erosion erratics evidence explain extending facts feet formation formed Geol Geological geologists gives Glacial period Glacialists glacier gravel greater ground heat height hills ice-sheet indicate Island Kendall lake land later London lower Magazine marine mass material meeting miles moraine mountain movement nearly northern Notes ļ ļ observations occur origin phenomena Pleistocene portion present probably Prof Professor reached recent referred regarding region remarkable ridge river rock sand Secretary shells shore side similar slope southern stones streams striae submergence surface Survey temperature terminal theory thickness UPHAM upper valley
Pagina 189 - Thus three ridges approximately parallel are simultaneously forming — one in the middle of the tunnel and one on each side. When the ice has fully melted away, this debris will present all the complications of interlacing ridges, with numerous kettle-holes and knobs characterizing the kames ; and these will be approximately parallel with the line of glacial motion. The same condition of things exists about the head of the subglacial stream on the east side, also near the junction of the first branch...
Pagina 159 - Lawrence region, is known, as so fully described by Sir William Dawson in his recent work, "The Canadian Ice Age," and in his many earlier papers, by their remains in the Leda clays and Saxicava sands, deposited during the short interval between the glacial retreat and the reelevation of the land from its Champlain subsidence.
Pagina 246 - The magazine has received a cordial welcome and a generous support from leading geologists everywhere and it is now recognized as the exponent of the rapid geological progress that is taking place on the continent of North America, including Canada, the United States and Mexico.
Pagina 46 - Tillage, or the greater and principal part of a village, built on chalk far away from any place where the Chalk formation occurs in place, or any outliers of that rock are seen. The evidence is striking. There are ponds and pits about in bare chalk, the soil in the gardens is chalk, and the graves in the churchyard leave off in chalk. There are numerous old excavations besides, whence hundreds of loads of chalk have been got out and carted away to the farms adjacent. The flints in this chalk are...
Pagina 204 - Fifty cents per year postage must be added to these rates for subscribers not living in North America. If bound volumes are ordered the cost will be $24.50, and the transportation must be paid by the subscriber.
Pagina 214 - Boulder-clay with northern erratics ; but seldom themselves contain other materials than those which could have been derived from the Tertiary or Cretaceous series in the south-east of England. No marine fossils of contemporaneous age have been found in these deposits, but remains of land animals occur occasionally in and under them. The author has found that their geographical distribution is much...
Pagina 189 - ... glacial debris. In numerous places the roof of this tunnel has broken in, and the tunnel itself is now deserted for some distance by the stream, so that the debris is caving down into the bed of the old tunnel as the edges of ice melt away, thus forming a tortuous ridge, with projecting knolls where the funnels into the tunnel are oldest and largest. At the same time, the ice on the sides at some distance from the tunnel, where the superficial debris was...
Pagina 141 - Lafayette period, or time of preglacial epeirogenic elevation, with the deposition and erosion of the Lafayette beds, some 60,000 to 120,000 years ; the Glacial period, regarded as continuous, without interglacial epochs, attending the culmination of the uplift, but terminating after the subsidence of the glaciated region, 20,000 to 30,000 years ; and the Postglacial or Recent period, extending to the present time, 6,000 to 10,000 years.
Pagina 43 - I at once perceived that it was no spar, and not placed there by human agency : it was the trunk and root of a tree, which had apparently grown there and flourished, but at what date who will venture to say ? It is indeed one of the questions involved in the change of this climate. As the men proceeded with the removal of the frozen clay surrounding the roots, which were completely cemented, as it were, into the frozen mass, breaking off short like earthenware, they gradually developed the roots,...
Pagina 126 - Palrearctic regions respectively. (4) The true and the only glacial climate which we know to have prevailed in the Arctic lands was not during the so-called glacial age of geologists, that is during the Pleistocene period, but in that which is now current, and which is the product largely, if not entirely, of changes of level in the earth's cnm which have occurred since Pleistocene times. THE " Geology of Dublin and its Neighbourhood" has found a clear interpretation at the hand of Prof.