438 



ME. G. BARROW ON THE MOINE GNEISSES [Nov. I904, 



Banded material is seen in the scars to have thinned away, and to 

 be no longer separable on a map. In this direction the Dark Schist 

 slowly thickens, until in a lew places the full sequence may be seen. 

 The third section occurs about 3 miles to the south-east of 

 Balmoral, on the ridge north-west of Girnoch Burn. Here the 

 Main Limestone (9828) is often separated from the Quartzite by 

 quite a thin parting of dark siliceous schist, which locally thickens to a 

 flinty Parallel-Banded rock (9816), resembling the specimen 11,125 

 of the Honestones from Glen Mohr. It is, however, still more like 

 a flinty biotite-schist that occurs repeatedly in the corrie behind 

 Coldrach in Glen Clunie, but is there in contact with the Little 

 Limestone. The extent of the hiatus at the Girnoch ridge is 

 thus clearly defined ; the whole of the Dark Schist and the Little 

 Limestone is missing, and this is exactly the hiatus with which we 

 started, at Gilbert's Bridge, 30 miles away. 



Fig. 7. — Diagram showing the true succession of the rocks described. 

 Schist \ 



Coulc- 

 J?lirhtcLS 



) 



Meii?v 

 Li?nestone 



Dcvrk 

 Schist 



Little 

 Limestone 



ILo7zest07ze 





Jt? = a 



Uv-JL&jg 



fol'-c—lflftr l|l 



=Ji_*. 



''~^~" "" — *~ 



Quc&rtzitz 



- i 



~ ~-^ L '/ve 



Ofi- 



*-/? 



??/©* 



__■#- 



PASSING TO MOINE GNEISSES 



From the evidence adduced, it will be seen that along a line more 

 than 30 miles long the Moine Gneisses, when traced to the south- 

 east, tend both to thin away and to pass into a material which was 

 originally of a more muddy nature. Along a considerable portion 

 of this line, the change is accompanied by a rapid decrease in 



