1 66 



quartz veins lying in the stratification planes on the domes 

 had their origin in the deposition of quartz in fissures pro- 

 duced by the close folding and the consequent slight slip- 

 ping of the strata upon one another. The fissures in which 

 cross-veins were deposited, are also probably due to move- 

 ments but, unlike those in which the interbedded veins 

 were deposited, are quite local. A few cross- veins lie in 

 fault planes of greater magnitude. 



Cleavage is well developed throughout the field. In 

 some places and more especially in the vicinity of sharply 

 folded anticlines and synclines, the quartzite is squeezed 

 into quartz-schist and the slate into mica-schist. The 

 planes of cleavage are parallel with the axis of the folds, 

 and are highly inclined, often only several degrees from the 

 vertical. It is a noteworthy fact that in the vicinity of an 

 anticline the planes of cleavage dip towards the centre of 

 the fold. In those slate beds carrying quartz veins the 

 cleavage plane is frequently found to curve aside on ap- 

 proaching the crest of a corrugation. Distinct serrat- 

 ions are frequently found along bedding planes and are 

 due to motion along the cleavage plane, and it may be 

 that some of the small crenulations found in the quartz 

 veins are due to the same cause. 



At the apex of the anticlines the thickness of the beds of 

 slate of the Goldenville formation is often much greater 

 than on the limbs. As folding proceeded there was some 

 sliding of the beds upon one another, pressure at the apex 

 of the folds was somewhat relieved, and the slate being 

 more plastic than the quartzite was squeezed from the 

 limbs to the apex. In some places the pressure was great 

 enough to force all the slate aside and bring the beds of 

 quartzite together. The compression of the beds on the 

 limbs of the folds must have had the effect of diminishing 

 considerably the original thickness of the sediments. In 

 calculating the thickness of the series, this compression 

 was not taken into account, so it is reasonable to suppose 

 that the original thickness must have been much greater 

 than that measured, but how much greater it is difficult 

 to estimate. 



Age. 



The Goldbearing series has been referred by different 

 writers at different times to various ages from Pre-Cambrian 

 to Ordovician. Although a Lower Cambrian age has been 



