The Quarterly journal of the Geological Society of London . io-glacialrefers to deposits which have been formed by rapidly-flowing glacier-streams at or some distance from terminal moraines ; while the terminterglacial does not, of course, imply that during such a periodthe Alps were free from ice, but refers to deposits formed duringmore or less protracted periods intervening between general glacia-tions : that is, to periods during which the glaciers were restrictedto the Upper Alpine regions, where they oscillated within compa-ratively narrow limits, as they do in our own da)\ Hence bothflu
The Quarterly journal of the Geological Society of London . io-glacialrefers to deposits which have been formed by rapidly-flowing glacier-streams at or some distance from terminal moraines ; while the terminterglacial does not, of course, imply that during such a periodthe Alps were free from ice, but refers to deposits formed duringmore or less protracted periods intervening between general glacia-tions : that is, to periods during which the glaciers were restrictedto the Upper Alpine regions, where they oscillated within compa-ratively narrow limits, as they do in our own da)\ Hence bothfluvio-glacial and interglacial gravel-deposits are essentially fluviatilein character, as distinguished from morainic or glacial depositsproperly so-called. II. Deposits near the Lakes of Zurich and Constance. 1. Cavernous Nagelfluh. (Figs. 1 to 5.) The remarkable fluvio-glacial deposits of Pliocene, so-called looherige or CavernousNagelfluh, on the summit of the Uetliberg near Zurich (fig. 3), and Fig. 3. Uetliberg, n. Zurich. 8781 Miocene. near Baden, about 15 miles below Zurich (4, fig. 1, p. 369),were described in the paper already quoted (Geol. Mag. 1894). 1 Fluvio-glnciale Ablagerungen in der Nord-Schweiz, Beitrage zur geol. Karted. Schweiz, 1891. 372 PLTJVIO-GLACTAL DEPOSITS IN SWITZERLAND. [Aug. 1895. Since then I have examined several other deposits, notahly that onthe summit of the Gebensdorfer Horn (5, fig. 1, p. 369), about 4 mileswest of Baden, near Turgi, the point of confluence of the riversAare, Reuss, and Limmat; and an extensive bank about 2 milesin length in the Glatt Valley east of Zurich, between Uster andWetzikon (6, fig. 1). All these deposits are characterized bypractically the same features and composition: that is, they showoccasional stratification ; the pebbles in the upper portions are, onthe whole, better rounded than in the lower portions, where theyare often striated; and the deposits generally pass into sand, and, insome cases, in
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