520 GEOLOGY AKD PETEOGRAPHY OF CLAEENCETOWN-PATERSON DISTRICT, ii., 



Starting at the west the Paterson anticline is shown by the existence of a 

 fairly steady change in the strike from Mt. Johnstone, where the beds dip at 18° 

 in a direction W. 10° S., to Dunn's Creek, where the dip is to the south-east at 

 40°. Near Paterson Township the strike is about due east and west. Taking 

 into consideration the relation of the topography to the disposition of the strata, 

 one can see that S.S.W. of Mt. Johnstone there is a pronounced bulge upon the 

 general anticlinal surface and that, at Hungi-y Hill, there is evidence, in the dips 

 and present positions of the rocks that, prior to the strike-fault shown at that 

 locality, the structure was. that of a local flat strike-trough superimposed on 

 the main dome. 



The Paterson anticline is adjacent to a syncline which trends up the valley 

 of Dunn's Creek, the axis of the basin bearing about north-east and south-west. 

 The existence of a general dip of 40° to the south-east and of 25° in direction 

 N. 60°W. on opposite sides of the fold indicates the asjTumetry of this structure. 

 An interesting point about this area is that, on account of the syncline occurrence, 

 a small outlier of Permo-Carhoniferous rocks has been preserved. Equally im- 

 portant is the evidence that, a little to the north of these rocks, the surface of 

 the basin is quickly bent up into a less inclined position so that disconnected out- 

 crops of the Paterson dellenite occur at the head of Dunn's Creek possessing a 

 local flat dip. 



The eastern limb of the syncline trends down towards Butterwick, from 

 which place the fairly simple disposition of the Williams River anticline begins. 

 A glance at the map will show this fold clearly delineated by the outcrop of any 

 of the indicator horizons. There is some evidence for assuming a local twist 

 in the general curve of the outcrop near Felspar Creek. 



The faulting, most of which, as will be explained below, occurred in Palaeo- 

 zoic times, has complicated matters, but by mentally restoring the strata to their 

 pre-faulting positions, one can clearly see that the folding was the outcome of 

 tangential pressure • exerted in a general east or west direction, followed by sub- 

 sidiary warping in a meridional direction. The significance of the irregularities 

 of the folding will be considered on a later page. 



The sections across the area, most instructive from the point of view of 

 physiogTaphy and tectonics are those along the lines F Q R S. and XYZ (Plate 

 xxvi.), descriptions of which are given below. 



Section PQBS. (Text-fig. 1.) 



At Mt. Johnstone on the western end of the line, the Paterson toscanite is 

 found capping the bold Mt. Johnstone ridge, dipping at 18° in a direction 

 W 10° S. Coming down the face of the ridge the lower portion of the Glacial 

 Stage is passed over and the beds of the Volcanic Stage are reached. These 

 liave been much eroded and form the flat land bordering the Paterson River. To 

 the east of the river an important fault. Pi, throwing to the east, is crossed, and 

 the lowest members of the Glacial Stage again come to view. These and the 

 succeeding beds are traversed in the valley of Tucker Creek and, passing the 

 fault, r2, the northern end of the Dunn's Creek syncline is reached, the line 

 passing to the south of where the synclinal surface is warped up into the broad 

 dome-like fold, thus permitting the inclusion of the Main Glacial Beds in the 

 section. Soon the line of traverse is back on to the lower portion of the Glacial 

 Stage which is exposed in very rough country. The section now shows the 

 Williams River anticline, which is broken by two large faults, Fs and F4, a 

 small area of Volcanic Stage rocks being passed over between these dislocations. 



