THE ACADIAN TRIASSIC 257 



to be greatest on the west, with a downthrow of 1,500 feet or less. 

 Parallel to this fault is another at Clarke Head which has brought 

 the Triassic down on the north against older rocks on the south, 

 forming a small graben shown in Fig. 17. All the rocks at Clarke 

 Head are intensely faulted. 



The remnants of North Mountain basalt at Cape Sharp and 

 at Partridge Island appear to be faulted off on the south side. 

 The throw of this fault is uncertain in direction, but it may be a 

 continuation of the southernmost fault at Clarke Head. 



The exposure of North Mountain basalt at Cape d'Or exhibits 

 several faults in a north-south direction, as shown in Fig. 12. The 

 end of Cape d'Or is probably on an east-west fault line. This 

 same fault may extend eastward. 



The Five Islands region exhibits complex block-tilting with 

 blocks of relatively small size. Besides the fault bounding the 

 Triassic on the north, and the Cobequid fault farther north, an 

 east-west fault is shown at Gerrish Mountain (Figs. 20, 22). The 

 Five Islands are each separated by faults and are each tilted in 

 different directions. These faults on the north become lost in a 

 greatly slickensided region shown in detail in Fig. 21. The slicken- 

 sided surfaces are usually vertical and have a north-south direction. 

 The major movement appears to have been in a horizontal plane, 

 but the stratification shows that there also has been vertical move- 

 ment. Many other north-south faults are shown along the shore 

 from Clarke Head to Five Islands, and a typical section is shown 

 in Fig. 19. 



Near Lower Economy a strike (east-west) fault brings the 

 Triassic down into contact with a mass of Pennsylvanian strata 

 on the north on which the Triassic rests unconformably. 



The hook of North Mountain, at Cape Split, is cut off by a 

 northeast-southwest fault which gradually cuts across this limb 

 of the Scots Bay syncline. 



North Mountain is composed of basalt flows tilted to the north- 

 west so that an erosion escarpment is produced on the south side 

 of the mountain and a gentle dip-slope on the north side. The 

 sea-cliffs on the north side are never very high for this reason. 

 With a continuation of the dip-slope, the erosion top of the flows 



