MOUNT GEEYLUCK. 



139 



Fir.. 32. — Diagrammatic sketch of the north 

 side of a ledge at Locality 297, on Quarry hill, 

 New Ashford, showing plumbaginous schist in 

 conformable contact with underlying crystal- 

 line limestone, and ;i cleavage foliation cross- 

 ing the stratification foliation of the schist at 

 various angles. 



CASE II. 



About 150 feet northeast of locality 602 there are two very small folds 



in the limestone, passing into a very low southwesterly dip on the west, 



(See Figs. 32 and 78.) In the overlying 



plumbaginous schist there are corresponding 



undulations, but these are compounded of 



more minute ones and crossed by cleavage 



planes. Where the plications dip 50° south- 

 west the cleavage planes dip 40° to 50° east. 



Where the former dip 15° to 20° southwest 



the latter dip 35° east, ami, again, where the 



former are more nearly horizontal the latter 



are vertical. Fig. 33, taken from the upper 



portion of the section (Fig. 32), shows the relations first described. Fig. 34, 



taken from a slightly enlarged 

 photograph of a large section 

 of a specimen from the same 

 portion of the ledge, shows 

 more distinctly what is but 

 slightly apparent in Fig. 33, 

 namely, that the cleavage 

 planes arise in a faulting along 

 the shanks of the plications. 

 In many Cases the faulting is 

 only incipient. In a specimen 

 from the central part of the 

 ledge where the cleavage 



Fig. 33.— Specimen in inverted position, facing south, from the 

 upper part of .1,, rock figured in Fig. 32, locality 297, Quarry hill, plaiK'S are Vertical tllCV are 

 New . \slil.ini. Plumbaginous schist with a stratification foliation shlinle ioillt-like fractlU'eS 



dipping southwest al i 50 , crossed by a coarse cleavage foliation 



di P pin g 40 so e. From a photograph. across the stratification folia- 



tion of the schist, but along one of these faulting has occurred, and the 

 stratification foliation is bent about into the direction of the cleavage. 



We have here, then, a cleavage which is in part a microscopic joint- 

 ing, in part what Ileini has called "Ausweichungsclivage 1 " (slip cleavage), 



'Sec Ileini. op. cit., vol. n. p. 54,Gesetz7, and Atlas. PI, siv, Figs. 17. is; PI. xv, Pigs. 7, 8, 9, 11,14. 



