245 



slate down to tlic top of the melapliyr, can, taking tlio liigli 

 inclination of the beds into account, scarcely measure less than 

 2,000 feet. The main strike-fault is broken, as the ma[) 

 shows, by several transverse faults, which add much to the 

 complexity of the contact.^ 



At the southeast angle of the cove, the slate is exposed 

 almost continuously for a distance, measured at right angles to 

 the strike, of about 90 feet. The contact with the melaphyr 

 can not be observed, the nearest outcrops of the two rocks at 

 this point being 30 feet apart. It is probable, however, that 

 the real contact is near the most easterly exposure of slate, since 

 a hundred feet to the north the outcrops of melaphyr advance 

 nearly to this line. The strike of the slate is about N. 20° E. ; 

 and it dips away from the melaphyr, the inclination diminishing 

 westward from 65" or 70° to 60°. For the first 20 feet it is 

 quite massive and of a very dark gray color, although weathering 

 whitish ; but beyond this, or upwards, it becomes gradually 

 much lighter gray and distinctly banded or laminated. It is 

 well jointed throughout, but shows no distinct cleavage. The 

 lower, massive portion of the slate, which, fortimately, has 

 been quai-ried to a limited extent and thus affords a clean, fresh 

 exposure, exhibits within the first five to eight feet of the base, 

 several distinct zones coinciding in direction with the bedding 

 of what appear at first glance to be simply black spots 

 or blotches in the rock. More careful inspection, however, 

 shows that they are really sharply outlined inclusions of a nearly 

 compact and evidently igneous rock, in other words, pebbles. 

 They are, as a rule, somewhat rounded or water-worn. They 

 vary from a small fraction of an inch to several inches in 

 diameter j and their longer axes usually coincide, after the 



' During the three years since the coloreii map of this district was drawn, tlie 

 discovery of additional outcrops of slate along the east shore of Hull's Cove has led 

 me to a somewhat different view of the relations of the slate and conglomerate, the 

 conglomerate appearing now as a limited bed in the slate. Consequently a new map 

 of this interesting shore has been drawn (PI. 11), which will be found to agree much 

 better than the colored map with the following description of the ledges. 



