315 



Miles. Furlgs. 



2. Trap from Dunluce Castle to the Bushfoot, . .20 



3. Chalk, east of the Bushfoot, .... 0 3 



This chalk rises like a flat segment, and dips 

 under the trap east and west. 



4. Trap from Blackrock to Port Bradan, . ..47 



This trap includes the Giant's Causeway, and 

 gives a view of all the columnar layers about Ben- 

 gore Head, which form a great arch, as already 

 described. 



5. Chalk from Port Bradan to Port Campley, . 1 7j 



The western junction of this chalk with the 

 trap is a vertical fault. On the east the chalk 

 dips under the trap. In this division the chalk 

 of Whitepark is all elevated in the form of a great 

 arch; its base line in the middle is about 100 

 feet over sea level, but the lias and inferior 

 rocks under it are mostly covered with sand. 



6. Trap from Port Campley toBoheeshane Bay, . 0 3 J 



This trap is a protruded mass. It has chalk 

 on the west, south, and east of it, and reaches 

 only a short way inland. 



7. Chalk from Boheeshaue Bay to near Carrickarede, . 1 0 



The junctions with this chalk are complicated. 



8. Trap from near Carrickarede to the Giant's Glen, 0 5^ 



9. Chalk from the Giant's Glen to Portmore, ..04 



This chalk has trap on top, and it dips both 

 east and west under it. 



10. Trap from Portmore to Doney Gregor, ..14 



A triangle of chalk is included in this division. 

 About the middle of it, at Kenbane Head, there 

 are one or two large masses of chalk caught 

 np in the trap and separated from the parent 

 . rock ; one of these is described at page 287. 



11. Trap from Doney Gregor to Ballycastle, on the 



top of the cliff, 17 



Bather more than half way in this division the 

 chalk rises from the water, forming a white flat 

 segment, which ascends in the middle to half the 

 height of the cliff. The base line of this arch 

 is about three furlongs. 



At Ballycastle is the line of separation between the great field of 

 trap rocks, at the surface on the west, and the coal-measures along the 

 shore to the east. This change appears to have been produced by one 

 of those faults on the great scales which I have been just describing. 

 The line of this fault is nearly north and south. It is in the stream 

 at Ballycastle, which comes down from Cape Castle, along the west side 

 of Knocklayd mountain. This stream seems to be the seat of it. In 

 the fault there is a downthrow to the west of the coal-measures, chalk, 



