482 E. M. KINDLE SEPARATION OF SALT FROM SALINE WATER 



muds show the same contrasts in saline and fresh water as non-calcareous 

 mud. The flat polygons and linear character of the mud-cracks in the 

 saline mixture are in sharp contrast with the upwarped fresh-water poly- 

 gons separated by broad spaces. This difference between fresh and saline 

 mud-cracks has been discussed elsewhere.^'^ 



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k 



k*^i'- 



FlGURE 



-Mud-crack in a salt-ioater Mixture of slaked Lime 



In their lack of depth and in their surficial character the mud-cracks 

 in the saline lime mud strongly remind one of the mud-crack, which is a 

 common feature of the Pemalia limestone at Kingston, Ontario. A very 

 characteristic feature of the Pamelia limestone near Kingston is the 

 presence in the lower half of the formation of beds with very perfectly 

 preserved sun-cracks (figure 12). They occur in limestones of very fine, 



1* E. M. Kindle : Some of the factors governing the formation of mud-crack, 

 of Geol., vol. 25, 1917, pp. 1.35-144, figs. 1-6. 



Journ. 



