"BATHOLITHS" OF HALIBURTON-BANCROFT AREA 791 



The facts presented above do not mean that cross-cutting bodies 

 are lacking in the Haliburton-Bancroft areas. They are found 

 but are by no means as common as concordant injections. 



It seems fair to conclude, therefore: (1) that the so-called 

 "batholiths" were formed by the concordant injection of granite 

 into a fissile limestone terrane; (2) that this fissility was produced 

 by the pressure of the overlying sediments; (3) that the layers of 



Fig. 3. 

 p. 596). 



" Stromatolithic " structure (C. N. Fenner, Jour. Geol., XXII [1914], 



limestones, lying between layers of molten granite, were permeated 

 by the pneumatolytic gases and fluids given off by the granite 

 and transformed to amphibolites or gray gneisses; (4) that the 

 concordant injection of the granite produced the dome-like char- 

 acter of the "gneissic" areas; (5) that the term " batholithic " does 

 not describe the true character of these areas and the term "stro- 

 matolithic" 1 is suggested in its place (Fig. 3). 



1 From Greek (rrpufia, "a layer," and \idos, "a stone." The noun "Stromatolith" 

 may be denned as a rock mass consisting of many alternating layers of igneous and 

 sedimentary rocks in sill relationship. 



