part -3] GLACTATION OP NORTH-EASTERN IRELAND. 389 



stratified drift in which the stream has cut several sections. 

 There is also an upper terrace at 700 feet a quarter of a mile south- 

 west of the 'pot,' and this bears on its surface a small moraine- 

 like ridge. These features belong to the area investigated by- 

 Prof. J. K. Charlesworth, and their explanation rests with him. 



The country between Garvagh and Kilrea is deeply drift-covered, 

 the material lying in irregular mounds strongly suggesting 

 morainic country ; but in several places, as at Moneydig Hill, long 

 ridges are produced by the outcrops of dolerite-sills in the Tertiary 

 basaltic series. Streams have cut deep valleys in the drift in many 

 places, and some of these are out of proportion to the present 

 drainage, as at Grove Bridge, 4 miles west of Kilrea. The valleys 

 fall northwards, and were probably excavated by water flowing 

 away from the melting ice-front during the period of retreat. 



Another of these valleys lies at the foot of the western face 

 of the dolerite escarpment at Moneydig Hill. 



At Kilrea are several large gravel-pits, and in one of these near 

 the railway, where the road from Garvagh enters the town, is a 

 section about 25 feet deep. The gravels contain much basalt with 

 smaller quantities of schist and vein-quartz, as well as some flint 

 and chalk, lithomarge, hornblende-diorite, and red granite from 

 the Tyrone Axis. I also found several pebbles of Ailsa Craig eurite. 

 In the lower part of the section the gravels are strongly current- 

 bedded, the dip of the laminae being northward ; while in the upper 

 part they are horizontally, though somewhat roughly stratified. 

 There is a capping of brown boulder-clay with few stones above 

 the gravel at the southern end of the pit ; while occasional beds 

 of very fine gravel, some of which are black with basaltic debris, 

 others clear yellow, occur in the current-bedded portion of the 

 coarse gravels. 



Another gravel-pit is to be seen near the river-bank on the 

 Kilrea side of Port Neal Bridge. The bedding is confused, the 

 gravels are distinctly morainic in character, and beds of sand occur 

 in the section, which is 30 feet deep. The contents of the gravels 

 are similar to those of the larger pit previously described. 



The country on the right bank of the Bann ojjposite Kilrea is 

 covered with mounds of gravelly drift similar to that just described, 

 and on the flanks of Loan Hill (600 feet) between Portglenone and 

 Hyndstown are many large mounds of drift between the 400- and 

 the 500-foot contours ; these are continued northwards to the 

 neighbourhood of Rasharkin, and are of the nature of a lateral 

 moraine. 



North of Tully (668 feet O.D.) is a broad streamless channel at 

 520 feet, falling north-westwards, and striae on the basalt close 

 by run in the same direction. The boulders in this part of the 

 area are chiefly of basalt, but there are also some from the Tyrone 

 Axis. 



The country south of Kilrea is distinctly morainic in character, 

 and there are numerous small lakes and swamps, some of which 

 occupy kettle-holes. 



