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IV.—Alpine, Lowland, and Jura Lakes in Switzerland
Published online by Cambridge University Press: 01 May 2009
Extract
In the preceding paper I dealt with the five principal and zonal sub-Alpine lake basins in relation to their age and origin, while the object of the present one is to group and consider the more prominent of the smaller Swiss lakes which I have had repeatedly occasion to visit and examine. Omitting the high altitude lakes, such as the Merjelen and the Engadine Lakes, which I described in previous papers, as also the hundreds of lakelets disseminated throughout Switzerland, I shall confine myself to those lake basins from whose glacial or hydrographic features definite conclusions may be drawn. The illustrations (Sheets Nos. 1–4, Figs. I–X), having to cover the large area of Central and Northern Switzerland, are necessarily drawn to a small scale, but all particulars may be gleaned from the Swiss 1 : 25,000 contour map, to which the metric altitudes and dimensions in this paper correspond.
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References
page 343 note 4 Geol. Mag., 1915, pp. 215–24Google Scholar.
page 343 note 5 Ibid., 1896, p. 97, and 1893, p. 222.
page 345 note 1 An illustration of the moraine wall cut by the Sihl at Schindelleggi will be found in my paper, Q.J.G.S., vol. lii, p. 570, 1896Google Scholar.
page 345 note 2 Both these ancient lakes are, in the near future, to be reconstituted for hydro-electric power purposes by valley bars, the Sihl basin alone being estimated to yield 60,000 horse-power.
page 351 note 1 Incidentally it may be mentioned that Lake Morat, like Lake Pläffikon, is noted for its remains of lake-dwellings.
page 351 note 2 An interesting case of subterranean torrents so characteristic of the Jura formation occurred a few years ago in the course of the works of the new tunnel from Frasne to Vallorbe (Simplon route), when a torrent rising in Mont d’Or and discharging normally by an underground passage near Pontarlier, suddenly burst through the tunnel near Vallorbe and discharged into the Orbe.
page 352 note 1 According to Dr. H. Walter (in a paper in 1896 on “Terrestrial Surface Changes in Canton, Zurich”), within the last 250 years since 1668, out of 149 lakelets shown in Gyger’s authentic lake-map of Northern Switzerland of that time, no less than 73 dried up and were obliterated and 16 were largely reduced in size.
page 352 note 2 The term delta does not apply to these cones, as they were not formed in standing water.