336 



MK. G. SAEEOW ON THE OCCUREENCE OF [Aug. I9OI, 



original clastic micas, to the finely crystalline slate in which no trace 

 of clastic mica has heen found anywhere in this district. Briefly, it 

 may be stated that at the junction of the Margie Series and High- 

 land rocks we find the deceptive 

 appearance of a stratigraphical 

 sequence, accompanied by intense 

 shearing of the softer rocks, so 

 characteristic of the more important 

 planes of overthrust in the North- 



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western Highlands. 



(X 



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(2) The Kirkton.~The sec- 

 tions about the Kirkton throw no 

 light on the nature of the junction 

 of the Margie rocks with those of 

 the Highlands, and their discussion 

 may for the present he postponed. 



(3) Crichie Burn, north of 

 Fasque (fig. 2). — In this small 

 lenticle the limestone has been 

 quarried on both sides of the burn. 

 On the soiath side of the eastern 

 quarry, the dark shales of the lime- 

 stone are in contact with the grey 

 slaty shale of the Jasper Series, and 

 both are greatly deformed. From 



-B |o our knowledge of the succession, it 

 is evident that the junction of these 

 two rocks cannot be a natural one, 

 and as there is no trace of normal 

 faulting here, it is probable that a 

 thrust-plane intervenes, the beds 

 on each side of it being intensely 

 sheared. On the north side of the 

 quarry, the beds are apparently 

 inverted as in the IS^orth Esk ; for^ 

 although the dip is northerly, the 

 strata are arranged in descending 

 order as follows : — 





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 ;=:l o 

 o -^^ 



5 =" 



o ^ 





1. Limestone. 



2. Dark shale. 



3. Ohocolate-colaured shale. 



4. Fine Margie Grits. 



These grits form the lower part 

 ^ of a small waterfall north of the 



quarrj?^, where their whiteness is 

 well marked, but it disappears about a yard above the fall. Here 

 the grit is clearly seen to be part of the Highland Series, and it 

 is further apparent that the sequence cannot be normal, for the 



