Geologiska föreningens i Stockholm förhandlingar, Volume 5

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Geologiska föreningen, 1881
 

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Page 130 - It should be remembered that the course of waters flowing under ground bears but a remote resemblance to that of rivers on the surface, there being in the one case a constant descent from a higher to a lower level from the source of the stream to the sea, whereas in the other the water may at one time sink far below the level of the ocean, and afterwards rise again high above it.
Page 69 - Speaking of the plateau of Bahia, he says : "Over this whole region there is an almost entire absence of loose materials on the surface . . . slight knolls and shallow basins alternate which rarely differ more than 20 or 30 feet in elevation. In the rainy season many of these basins become filled with water, forming shallow lagoas varying in area from less than one to more than 50 acres, from most of which the water evaporates in the dry >eason .... So numerous were these lagoas for more than 50...
Page 692 - Eine weitere Folge der oben angedeuteten Zusammensetzung aus Zwillingslamellen beruht in dem sich erhebenden Zweifel, dass die Zahl der von Scacchi als hemiedrisch betrachteten Flächen geringer ist, als er annimmt. In der That, wer weiss z. B. ob wirklich die Flächen a$ und o*, ob o ; , und ij, b l und d$, fti und <# zugleich existiren"? Könnten wir nicht, Sie und ich, ein a$ für ein o*, ein 6
Page 712 - Dispersion der Axen, geschätzt g < u.« Dies stimmt mit dem, was ich an den gelben Kafveltorp-Krystallen beobachtet habe. Dagegen sagt ES Dana: »With a yellow light (sodium) the angle was essentially the same, but the mean was 10' or 15' smaller, which would indicate that the dispersion is Q ]> v.
Page 62 - ... also described it ; but it appears to me that he has greatly over-estimated the depth to which the softening of the rocks has extended, when he says that, in the gneiss region between Sao Fidelis and the Serra dos Orgaos, the gneiss has been decomposed to a depth, in some places, of 300 metres ! ! f This decomposition results, in my opinion, from the action of the warm rain-water soaking through the rock, and carrying with it carbonic acid, derived not only from the air, but from the vegetation...
Page 692 - Zwillingsbilduni; entstehenden Störungen zu vermeiden. Da dies aber bei der sehr grossen Zahl von Zwillingsblättern als unmöglich sich erweist, so muss man sich darauf beschränken, auf die Möglichkeit einer Verwechselung hinzuweisen.
Page 58 - ... more or less strong evidence of having been subjected to much erosion and crumpling. But the farther we recede from the principal centers of glaciation, and the nearer we approach the extreme limits reached by the icesheets, the more extensive and the less disturbed do interglacial deposits become. In a word, they occur in best preservation where the erosive power of the ice was weakest ; they are entirely wanting where we have every reason to believe that the grinding force was strongest.
Page 130 - ... remembered, that the course of waters flowing under ground bears but a remote resemblance to that of rivers on the surface, there being, in the one case, a constant descent from a higher to a lower level from the source of the stream to the sea ; whereas, in the other, the water may at one time sink far below the level of the ocean, and afterwards rise again high above it.
Page 130 - It would follow from the views above explained, that there must be a twofold circulation of terrestrial waters ; one caused by solar heat, and the other by heat generated in the interior of our planet.
Page 281 - Vetenskaps-Akademien, om en med understöd af allmänna medel utförd vetenskaplig resa till England.

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