366 SKY. GEOLOGY. OVERLYING ROCKS. 



surprised that the contact is not oftener to be seen. It 

 may possibly be found in a similar position at Loch Sli- 

 gachan, but in that place I observed only a junction of 

 another kind. This consists of a bed of white sandstone 

 found at a considerable elevation in the hill of Glamich, 

 and apparently involved on all sides in the syenite. It 

 may perhaps belong to the next modification, and in that 

 case the sandstone bed is merely cut off on one side by 

 the intrusion of the overlying rock. 



The next mode of junction is that where the syenite 

 is found intersecting the body of the strata at some 

 angle, while these terminate abruptly against it, being 

 generally diverted to a certain degree from their natural 

 position. The only instance I shall here quote occurs 

 at Kilbride, and it has been already noticed in speaking 

 of the limestone. It is needless to add to these any other 

 examples to prove this double connexion between the 

 stratified rocks and the syenite, as the same phenomena 

 must have been witnessed, at least in the analogous rocks, 

 by every geologist. 



Were it possible to gain access to the numerous junc- 

 tions which must take place along the irregular line that 

 in Strath separates the syenite from the limestone, many 

 interesting appearances might probably be observed. It 

 would in particular be desirable to know the precise cir- 

 cumstances under which the marble occurs with relation 

 to the syenite ; and whether, where this rock intersects, 

 it produces different effects on the strata from those which 

 occur where it merely overlies ; a circumstance very re- 

 markable in the instances referred to on the Broadford 

 shore and at Kilbride. But there is no hope of such 

 access, and we must remain content with knowing that 

 the presence of syenite, like that of the corhmon trap 

 rocks, is often attended by a disturbance of the regularity 

 of the adjoining strata, and by changes in their texture ; 

 although in some instances no such changes take place. 

 It is superfluous to dwell on that which must have 



