TIIK BUILDING OF AN ISLAND. 23 



When wc look for it on the east side of Barren Spot Village we find a soutli- 

 erh- dip, and as such southerly dips prevail on the line north from this position 

 it would seem that the axis must be regarded as lying along a narrow band, 

 across which the dip probably changes in a gratlual, but somewhat irregular 

 manner from southeast to southwest. 



It is verv noticeable that the synclinal axis now traced does not pass down 

 the middle of the Central Slope, as we mav have expected after finding the dips 

 similar in amount on both slopes of the synclinal, but that it passes nearer to 

 one side than to the other, namely, nearer to the western than to the eastern side ; 

 but this apparent anomaly disappears when we notice that on the west side of 

 the Slope the limestone formation extends right across the valley that bounds 

 the Slope and even rests in a considerable mass (at Windsor and Concordia) 

 against the Salt River Hills ; whereas on the eastern side of the Slope the for- 

 mation ends abruptly on the tops of the hills belonging to the Slope itself. In 

 other words, the boundary valley on the east side has been cut out of the rocks 

 of the older formation, while on the west side the boundary vallev has been 

 cut out of the limestone formation itself. This is what gives the apparent one- 

 sidcdness to the structure, and it explains some other peculiar features of the 

 district. 



It should be noted, however, at the same time that synclinals are by no 

 means always equally balanced ; but that it frequently happens that the two 

 sides differ considerably in their relative proportions, a fact which is indeed 

 exemplified, as we shall shortly see, in one part of this very synclinal which 

 we have been studvinsf. 



