678 



R. L. JACK AND J. HORNE ON GLACIAL DRIFT 



about 5 miles above Szigeth, the main road ascends to the level of 

 the upper terrace, which sweeps south to the base of the hills. At 

 this point the valley is only about a mile and a half broad, and 

 seems to be filled entirely with alluvial deposits. The same fact is 

 observable at Gross Bocsko, where the valley narrows to not much 

 more than a quarter of a mile. Again, near Lonka, several excellent 

 sections of these alluvial gravels are met with, which likewise 

 stretch from the one hill-slope to the other. At this point there are 

 also two well-marked terraces ; the gravel of the upper terrace 

 being upwards of 20 feet thick. The same horizontal beddiug is 

 discernible, while the deposit, as a whole, is pretty coarse, many 

 of the stones measuring 2 feet across. Here the Flysch-beds are 

 seen dipping up stream at an angle of 20°, and within a short dis- 

 tance reversed at a high angle, as shown in the following section 

 (fig. 2). 



Fig. 2. — Section near Lonka. 



a. Old alluvial terrace. 



b. Kecent alluvium. 



Sandstones and shales. Flysch- 

 beds thrown into a synclinal fold. 



Bather more than a mile beyond Lonka, the river flows between 

 steep pine-clad hills with no alluvial or drift-deposits on either 

 bank. Near this, however, three large erratics of quartz rock were 

 observed, one of which measured upwards of 90 cubic feet, and 

 another (partly concealed) upwards of 10 feet in length. Higher 

 up the valley, in a roadside-cutting, the quartz rock is seen in place, 

 and is rapidly succeeded by a fine-grained blue limestone, the latter 

 probably belonging to the patch of Dyas or Permian rocks repre- 

 sented in Yon Hauer's map. On the right bank of the Theiss, just 

 about a mile and a half below the point where it receives the waters 

 of the Visso, another drift-section is exposed. It occurs on the road- 

 side, and is about 100 feet above the level of the river. The 

 deposit consists of stiff dark-blue clay, stuck full of stones, some of 

 which range up to 8 cubic feet. The blocks, as a rule, are not 

 rounded ; and, though a careful search was made, no instances of 

 striae were observed. The absence of such may be accounted for by 

 the fact that the stones consist mainly of soft brownish- grey 

 micaceous sandstones, which would not readily retain glacial 

 markings. This section is about 2050 feet above the sea-level, by 

 aneroid measurement. 



It is worthy of note, as exemplifying the relation between the 



