102 E. 0. Tea/e: 



direction at a high angle. Fine sections are shown in the road, 

 cuttings, about two miles northerly from Hickey's Creek junction, 

 (see 12). From about tliis point, also looking south-easterly across 

 the deep valley of Hickey's Creek, there is an interesting view of 

 Wallaby Hill, showing on the upper portion bare dip faces of the 

 conglomerate striking at right angles to the direction of view. 

 At the same time, in the lower slopes, there are consi)icuous out- 

 standing ribs of conglomerate and sa,ndstone dipping at a high angle 

 to the north-east, and whose strike therefore is at riglit angles 

 to the rocky face forming the summit. 



Faults. — Keference to Map 3 and Sec-tion 5 of this area shows- 

 that an intense compressional movement at right angles to a N.N.W. 

 axis has nipped in and folded a belt of the Upper Palaeozoic sedi- 

 ments in a trough of older rocks. Along tlie western contact, at 

 several places, the rocks are disturbed and often much crushed. 

 A fine example of crushed rock is sieen in Hickey's Creek, close to the 

 old pack track, and about three-quarters of a mile from the Mac- 

 allister junction. Here a. portion outcrops as a conspicuous mono- 

 lith, about tliirty feet high. It' consists of broken Silurian quartz- 

 ite, forming a rough breccia, but distinct from the basal breccias, 

 and conglomerates of tlie Upper Palaeozoic, Avhich are clearly of a 

 detrital nature. Tracing the contact along in a north-north- 

 westerly direction, it is found that in addition to the crush features 

 a portion of the basal beds is cut out, the features in generjal 

 therefore indicating a persistent fault along this line. 



Transverse sections across the ^lacallister valley at intervals to- 

 the north, beyond the area included in this map, would seem to 

 indicate similar structural conditions. The western limb of the 

 broad anticlinal fold has been bent back to form- a minor syncline, 

 and faulted against the older rocks on the west. Tbis same feature 

 is recognisable still further north along this line in the map, and 

 section of Woods' Point sheet by 0. A. L. Whitelaw, and a gene- 

 ralised section compiled fi'om that map and extended to the east 

 from my own observations seems to provide a probable interpreta- 

 tion of the structure (Section 4). A minor fault with a north- 

 easterly direction intersects the major one, and corresponds in 

 position Avith the lower portion of Hickey's Creek, but it is the 

 other direction which is of greatest importance. 



The age of this tectonic movement cannot be fixed closely. It is 

 clearly post Lower Carboniferous, but may still be Palaeozoic, though 

 it seems probable that renewed differential movement may have' 



