42 



E. 0. Teale 



(a). Normal Diahase. 



The diabasic rocks show some variation in character from a 

 somewhat doleritic type to that of a dense basalt, the latter being 

 the dominant type. The dense forms are abnost identical in. 

 features with those of Heathcote. 



Though the sections at the Howqua do not show so clearly the 

 same interbedded succession, the character and occurrence of the- 

 diabase, and that of the associated chert-s are so similar that the- 

 assumption is reasonable that here, too, they represent similar- 

 submarine lavas, and tuffs, or interbedded cherts. 



Chemic.\l An.\i,yses of Diabases 



l!v K. (). Teale 



* Note low M{{0 content 



