382 MAJOll A. It. BWERRiTHOUSE OK THE [vol. Ixxix, 



About 2 miles west of Clady Bridge the road crosses a well- 

 marked glacial drainage-channel, which is marked on the Geological 

 Survey map of the Belfast district. It is deep and wide, with 

 steep sides and a flat floor, and doubtless carried the drainage from 

 the ice-front at a period slightly preceding the retreat to the line 

 Squires Hill-Lyles Hill (previously mentioned on p. 381). The 

 stream now flowing through this channel is very small. 



Deposits similar to those last described cover the country on the 

 south as far as the neighbourhood of the railway from Glenavy to 

 Lisburn, where the rocks from the Tyrone Axis come in (see 

 p. 375). 



The Northern Shore of Lough Neagh. 



It has already been stated that the drift-derived shingle on the 

 shores of Antrim Bay is devoid of rocks from the Tyrone Axis ; but 

 in the neighbourhood of Shanes Castle and Randalstown they make 

 their appearance in force. 



A section at the works of the Old Bleach Linen Company at 

 Randalstown shows reddish-brown boulder-clay 20 feet thick, con- 

 taining boiilders of basalt, Carboniferous sandstone, Carboniferous 

 Limestone, diorite, a coarse pyroxenic rock, epidiorite, a bright-red 

 granite, boxstones (ironstone from the Carboniferous rocks), pink 

 quartz-porphyry, and mica-schist (all from the Tyrone Axis and 

 the country west of Dungannon and Cookstown), as well as flint 

 and vein-quartz. I found no Scottish rocks in this section, and the 

 Tardree rlryolites also appear to be absent. 



Similar boulder-clay is seen in a stream-section on the road from 

 Randalstown to Cookstown Junction, a mile east of the former 

 place ; and Tyrone rocks occur as isolated boulders on the roadside 

 to within half a mile of Cookstown Junction Station. 



When Ave cross the main line of the Midland Railway from 

 Antrim to Ballyrnena, the Tyrone rocks are no longer to be found ; 

 but very large boulders of basalt and dolerite occur in the village 

 of Farranflugh, half a mile east of the line, and the Tardree 

 rhyolites are also present. 



The line of railway here marks the eastward limit of the western 

 ice, but not the western limit of the Scottish sheet, as Ailsa- Craig 

 eurite is found in small quantities much farther west ; for example, 

 Mr. Robert Bell has recorded it at Drumanewy, 2 miles west 

 of Randalstown. In this, and in many other cases, the Ailsa- 

 Craig rock is associated with Tyrone and other western rocks, and 

 is considered to be remanie from the deposits of the earlier 

 Scottish glaciation. 



As we follow the northern coast of Lough JNTeagh westwards from 

 the mouth of the River Main, near Shanes Castle, brown boulder- 

 clay is seen at intervals along the foreshore, and, as at Portlee, 

 Tyrone rocks are present. 



In the bay west of Conn's Point is a cliff of basalt capped by 

 red sandy boulder-clay, which contains boulders of basalt, schist, 

 diorite, vein- quartz, and quartzite. 



