454 GLACIAL GEOLOGY OF GREAT BRITAIN

Granite pebbles are abundant at theRigi Kulm Hotel.

Slickensides often occur in this con-glomerate, and the pebbles themselvesfrequently show slickensides.

The sliding pressure which has thusstriated the pebbles (so that some of them

resemble glaciated stones) has also

gouged pieces out of the individual

pebbles, and has produced curious finger-like depressions on them, especially onthose made of limestone.]

(See Rothplatz, Ueber Gerolle unit

Eindrucken. Z. D. G. G., 1880, 189.

•3 TT T) • 7 • A T1 1

>3 0. Heeb, Biographic, A. Eschars v. d.

■| Linth, where the latter observed this in

£ Von Dechen, Sitz. Nied. Gas. f.g Natur- u. Heilkunde , 1849.is Gumbbl, Geoqn. Bisch. Fichtelphyr,§ 1879, p. 479.

Daubkee, Etudes Synthetiques deg> Gaol. Experimental, 1. 1879, 382, and'£ Rothplatz, Ueber mechanische Gesteins -3 misshandlunqen. Z. D. G. G., 1879, 355,■3 and Naumann, Geognosie, 1. p. 413,m where many examples and references to

i literature are given.)

g [Every lake that I have seen in^ Switzerland is due to the damming up

of old valleys by moraine drift. The

drift dam of the Interlaken lakes occursto the w r est of them; that of SargenLake is north of Sargen; that of theLake of Lucerne is north of Lucerne ;that of Lake Zurich is in the town ofZurich. I have seen no evidence ofglacier excavation.

All these lakes also are diminishingin volume, as is seen at their upperends.]