486 ME. H. W. MONCKTON ON THE STIRLING DOLEEITE. [Aug. 1895, 



which comes in contact with the igneous rock, or in some cases 

 the hard margin of the igneous rock itself. The unusual hardness 

 of the marginal part of the igneous rock and the shale in contact 

 with it has been sufficient to arrest the denuding agents which 

 have removed the overlying strata. 



As one ascends, however, the igneous rock at the surface becomes 

 a dolerite, and in the upper ridges its coarse grain shows that the 

 marginal parts of the igneous rock have been wholly removed. 



Fig. 2. 



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Typo~Etch.ing Co.Sc. 



If one follows these ridges of igneous rock to the south-east, one 

 finds that the lowest runs out in a long tongue, as shown in the 

 sketch-map ; that the second ridge soon ends off against sandstone, 

 while the upper ridges continue as a high crag underlain by stratified 

 rocks, and facing the north-east. The high ground above this crag 

 and away to Sauchie Craig is covered with Boulder Clay and Glacial 

 Sands and Gravels, which are no doubt more or less underlain by 

 igneous rock. 



