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Obher localities afford the follow- 

 ing further evidences : — 



(5) (Mem. p. 149) ' The remark- 

 able difference in the number, 

 character, and direction of the 

 dykes in these slaty rocks [Nos. 

 2-4] as compared with those in 

 the Marbyl Flags [No. 5] seems 

 at first sight to suggest that the 

 Flags belong to a later system 

 than the Slates ' (Mem. Geol. Surv. 

 pp. 37-38). Further, ' in the coast- 

 section the slates are seen to be 

 greatly crushed and confused in the 

 vicinity of the junction, and they 

 appear to pass beneath the flags.' 



Among the presumptive reasons 

 for belief in the later age of the 

 Lonan Flags it may be mentioned 

 that : — (1) No locality is recorded, 

 nor can I discover one, where the 

 Lonan Flags are seen underlying 

 any member of the Slate Series. 

 (2) Whereas every member of this 

 latter series is more or less sub- 

 crystalline and metamorphosed, 

 every member of the Sulby-Flag 

 Series is more or less earthy and 

 largely unaltered. (3) Every 

 appearance, real or imaginary, of 

 an organic remain has been found 

 only in the flaggy beds, and none 

 anywhere in the Slate Series. 

 (4) Occurrences of a flag are 

 usually more accompanied by fold- 

 ing than any of the Slate Series, 

 eleven out of twelve such illustra- 

 tions being given in the Survey- 

 Memoir, and this frequency argues 

 for the lightness of the load that 

 they had to bear. (5) The long 

 series of flags in Laxey Valley, 

 though commencing with con- 

 tortions, but becoming more regular, 

 extend over 2| miles to their end, 

 and even more if we include Clay 

 Head, and yet show no sign of 

 infolds of the supposed higher 

 strata to which they are supposed 

 to approach. 



These are the chief reasons which 

 lead to the conclusion that the 



