MULL. -GEOLOGY. 557 



stances now mentioned, particularly from the fact of the 

 imbedded fragments; an appearance which cannot be 

 reconciled to any supposition yet offered, except that of 

 the posteriority of granite. 



The junction of the primary strata with the trap, on 

 their eastern margin, presents but little interest ; nor is 

 the actual contact often to be seen, the mutual boundary 

 of the two rocks being generally overwhelmed with rub- 

 bish. On the northern shore the line of junction is 

 narrow, although visible, the land being but little elevated 

 above the sea. The trap here abuts against the stratified 

 rocks, protruding both above and below them so as to 

 entangle a portion, and giving as satisfactory evidence as 

 we can expect, of the junction and of the boundaries of 

 the two. On the southern shore there is an interval filled 

 with rubbish at the point where they meet, and the same 

 occurs on the surface of the interior wherever I examined 

 it ; a circumstance, as I have remarked on other occa- 

 sions, of general occurrence. It is scarcely necessary 

 to add that veins of trap are found proceeding from the 

 main body and penetrating these strata. 



The description of Inch Kenneth will illustrate the 

 position and connexion of those primary strata that occur 

 on the shore under Gribon and Torosay. The quartz 

 rock, (or gneiss) with the superincumbent secondary strata, 

 is found occupying that shore for some miles ; commencing 

 near to Inch Kenneth, and terminating at a nameless 

 point which is noted in the map. The beds on the 

 northern portions of this line are regular, even, and thin ; 

 circumstances easily traced, because their broken edges 

 are placed outwards so as to form the cliffs. They vary 

 in the quantity of their inclination in different parts of 

 this line, but the dip is pretty uniformly S. S. E. or 

 thereabout. Near to Inch Kenneth they are elevated 

 to thirty degrees, becoming shortly horizontal, and then 

 again rising to an angle of fifty degrees. In their com- 

 position, the different rocks resemble both those of Inch 



