Vol. 58. | SUBALPINE PLIOCENE CONGLOMERATES. 453 
Molasse at about the same contour as the precisely similar deposit 
on the Gebensdorfer Horn, that is, at the 500-metre contour, or, 
roughly, about 200 metres above the present river-level. About 
6 miles farther down the Aare Valley, between the villages of 
Leuggern and Leibstadt, not far from the junction of the Aare and 
the Rhine opposite Waldshut, there occurs, again on the left of the 
Aare, another considerable deposit of Deckenschotter, about 30 metres 
in depth, which rests directly upon Muschelkalk and Keuper, the 
contact with the underlying rock being, as in the other cases just 
- mentioned, at about the 500-metre contour. 
(4) Passing from the confluence up the Rhine Valley, we find, in 
a distance of less than 20 miles, and chiefly on the left of the river, 
a whoie series of hills capped by more or less extensive deposits 
of Deckenschotter. Among these are more especially noteworthy 
the deposits near Zurzach, near Siglisdorf, the large deposit on the 
flat, dome-shaped hill called Egg, about 5 miles south of the Rhine; 
again, the deposits near Kaiserstuhl, on the Stadlerberg, on the 
heights near Weyach and Glattfelden; and, lastly, the large deposit 
which caps Mount Irschel, a conspicuous hill on the left bank of 
the Rhine, about 13 miles south of Schaffhausen.’ In all these 
cases the Deckenschotter, composed of Alpine material, and in some 
cases overlain by moraine, rests directly upon Molasse at contours 
gradually rising from 500 to 650 metres, the maximum being 
that of Mount Irschel. The conglomerate has a fairly uniform 
thickness of 20 to 30 metres, with the exception of the Zurzach 
deposit in the wedge between the Rhine and the Aare, where the 
Deckenschotter rests upon Dogger, and has been denuded down to 
Fig. 2.—Section across the Rhine Valley, south-west of Waldshut. 
Gravel Lower-Terrace Lower Terrace, -—=Muschelkalk == 
Black Forest or Baden side Swiss side 
S.W. of Waldshut near Leibstadt. 
_Loess _ ckenschotter at 
500 1 yyy ypeck Set uli ae Li Lilla 500 
Z 5 aie sravel sravel 
Black Forest Guess -"MWWIIIE Za Wi a 
ack Forest: E1sSs LZ. Yy j 
Del. D.R.P. 300 metres 
about 10 metres in depth. The averag® height of the contact of all 
these deposits with the underlying rock is about 200 metres, and, 
in the case of Mount Irschel, about 350 metres above the present 
level of the Rhine. 
(5) Several Deckenschotter-deposits, from 15 to 25 metres thick, 
also occur on the right bank, or Black-Forest side of the Rhine, 
1 The Kohlfirst, a hill immediately south of Schaffhausen (see fig. 1, p. 452), 
is also capped by Deckenschotter, the contact with the underlying ae being 
at about the 670-metre contour. 
CoG. Wo, 231. OEE 
