SKY. GEOLOGY. RED SANDSTONE. 303 



increases to thirty degrees or more, and then becomes 

 again reversed to the eastward, under which inclination 

 it continues for a considerable space. The north-eastern 

 direction of the edges of the strata still continues, and, 

 to avoid repetition, this must be understood to be a con- 

 stant feature where the contrary is not expressed. 



The reversal of the dip takes place in Ben na Ree, and 

 the eastern dip, being once established, is traced towards 

 the Kyle rich for a considerable space, when it is again 

 reversed to the west. If the line of this shore be traced 

 to Ben Ashlaig it will be found to correspond to the 

 direction of the strata, and thus far therefore we have 

 access to one limited set of beds only, along this whole 

 line. Their characters throughout this space are very 

 constant and uniform, since they consist entirely of the 

 schist already mentioned, interlaminated with quartz rock 

 of the same grey colour. The appearance of a regular 

 succession of graywacke to gneiss is thus preserved for 

 a long space, since the geologist does not easily discover 

 that he is proceeding on one line only of the stratification. 

 This conclusion is only invalidated by afterwards finding 

 that no progress has been made across the strata, and that 

 the beds not only change their natures in the course 

 of their prolongations, but that the same schist alternates 

 with the various sandstones even to the last moment of 

 their recurrence in the order of succession. 



It is necessary here to mention a small portion of gneiss, 

 too trifling in extent to have found a place in the general 

 account of that rock, but important notwithstanding its 

 smallness, since it serves to indicate the continuous regu- 

 larity of the bearings, as well as to prove the alternation 

 of the gneiss with the sandstone series. It is to be seen 

 at the foot of Ben Ashlaig, being marked in the map, and 

 it will be found to project a little beyond the linear boun- 

 dary of the coast which, as the map will also show, is con- 

 tinuous with that of the sandstone near Loch Oransa. It 

 thus serves to indicate that the gneiss of Sleat and that of 



