CRYSTALLINE ROCKS OF CEYLON. 



Ill 



right angles to the strike valleys. Sometimes a stream occupies 

 a strike valley for part of its course and a joint valley elsewhere, 

 the change being indicated by a sharp turn. Perhaps the best 

 illustration of the occurrence of parallel strike valleys is found in 

 the Hatton district ; in a map of this district the parallel valleys, 

 along which run road and rail as well as stream, are most 

 noticeable (fig. 3). 



There are no data available to estimate the actual thickness of 

 the charnockite series in Ceylon (measured in a direction at right 

 angles to the foliation planes), but it is clearly not unlimited, 

 corresponding portions of the series being repeated by the 

 foldings. 



1 



MAP 



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FIG. 3.— STRIKE VALLEYS NEAR HATTON. 



