No. 1.] BAILEY — GRAND MANAN. 49 



parts approacliing a grey syenite and in others becoming greenish 

 by an admixture of chlorite. No very distinct stratification is 

 visible here, but further south, towards the Swallow Tail Light, 

 this is more apparent, the beds becoming at the same time less 

 crystalline and associated with considerable beds of fine grained 

 indurated shales. These beds near the centre of the peninsula 

 exhibit a series of low undulations, but as the last named head- 

 land is approached their inclination becomes greater and their dip 

 (to the northward) more uniform. They are here associated with 

 altered gray sandstones and some thin beds of impure limestone, 

 and are traversed by veins of heavy spar, holding small quanti- 

 ties of galena and copper pyrites. Considerable masses of diorite 

 are occasionally met with along this shore, and at one point broad 

 lenticular sheets of fine-arained flesh-red felsite. 



In the small indentation known as Spragg's or Pette's Cove, a 

 somewhat abrupt transition in the character of the rocks may be 

 seen, for while the Eastern side of this Cove, forming the promon- 

 tory of the Swallow-Tail Light, has the uniform grey colour and 

 other features alluded to in the preceding remarks, the Western 

 exhibits a most marked contrast, being conspicuous, even for a 

 considerable distance, from the almost chalky whiteness of its low 

 cliffs. This appearance is due to the peculiar weathering of a 

 thick mass of pale liver-grey micaceous slates, which here form 

 the shore, dipping northward (N. 50*^ E.) at an angle of 50°. 

 Between these slates and the grey rocks first alluded to, thinner 

 beds of grey micaceous shales and impure pyritiferous dolomites 

 are poorly exposed along the beach, and near its northern side 

 fine-Grrained fissile black shales. The contact between these two 

 sets of rocks is obscure, but so far as I could judge, they appear 

 to be conformable and to be connected together by intermediate 

 gradations. That those last enumerated form a single series is 

 evident from their frequent alternation, as may be well seen on 

 either shore of the promontory separating Spragg's or Pette's 

 from Flag's Cove. The pale grey unctuous or nacreous slates 

 and black slates are here associated with hard grey somewhat 

 slaty sandstones (including thin layers of black slate) and coarse 

 grey and purplish sandy shales, many of the beds being more or 

 less filled with veins of brown spar or dolomite, and the whole 

 several times repeated by faulting. On that side of the peninsula 

 looking toward's Flag's Cove, some of the finer purplish beds are 

 Vol. VI. D No. I. 



