Vol. 57.] DEIFTS OF THE BALTIC COAST OF GERMANY. 



17 



admit the potency of ice-sheets as excavators, benders and breakers 

 of rock-masses, when any evidence worthy of the name can be 

 produced in proof that they operate in these ways ; but, though we 

 have diligently sought for this in the field, we can only find it 

 asserted on paper. Accordingly we feel justified in regarding it as 

 a theory which rests upon an hypothesis. Even if it were true, it 



Fig. 11. — Section in Von Rausemanri's Qvxirry. 



[Compare section in Quart. Journ. Geol. Soc. vol. Iv (1899) fig. 3, p. 315. The 

 above figure shows the Drift-filled hollow which begins at 5 in that sketch, 

 and may be regarded as continuing the sketch farther to the left, though the 

 face of the quarry has been worked some distance back.] 



The details in the part within a, b, c, and from d to all about d', are 

 obscured by * wash-over ' or slipped Drift. 



1 = Apparently clay all about here, but much masked, and gravelly sand is 



seen here and there below. 



2 = Sand, gravelly sand, and a reddish clay. 



3 = Bluish -grey clay — hardly less than 15 feet thick. (Probably identical with 



2 b of the former diagram.) 



4 = Well bedded sand, about 7 or 8 feet thick. The details at the angle are 



not quite clear, but there seemed to be fair evidence for its existence. 

 Well bedded sand, like a ' tongue,' can be traced to near the end of the 

 horizontal pipe (e), and then comes clay. 



4 a = Apparently a continuation of this bed of sand, dipping at a high angle.. 



(Probably identical with 3 of the former diagram.) 



5 = Olay : the apparent thinning-out is due to its passing at the back of a 



projecting edge of Chalk. (Probably identical with 2 a of the former 

 diagram.) 



6 = Chalk-with-flints. Diagrammatic, but accurate in important points. The 



blank part was not filled in, as that would have merely continued the 

 fold. 



From the number 6 to the top is apparently 60 feet. From the top of the 

 Chalk to the surface of the ground in the line of 1 and 3 is perhaps 30 feet. 



could not, in our opinion, explain the relation of the Chalk and the 

 Drift in this pit, and the way in which the great curving layers of 

 flint are cut off by the latter. We also find difficulties in under- 

 standing how the ice-ram could be brought into action here. The 

 crest of the anticline runs more or less northward, so the thrust 

 has come from an easterly or westerly direction. Now, in the 



Q. J. G. S. No. 225. c 



