362 T. W. E. DAVID. 



displacing the strata about 400 feet from the horizontal, 

 and 350 feet from the inclined plane due to their normal 

 easterly dip of about 100 feet per mile, and (2) a gentle 

 westerly fold, one mile west of the eastern monocline and 

 displacing the strata in a westerly direction 100 feet from 

 the horizontal and about 175 feet from the inclined plane 

 due to their normal easterly dip. 



From Lapstone Hill the above two features strike very 

 nearly due north to the Grose Valley, and it is evident 

 from the surface features, though the country has not yet 

 been geologically examined, that they reappear on the 

 north side of that valley but in a position about a mile 

 west of the general strike from Lapstone Hill. The cause 

 of this horizontal displacement has not yet been ascertained 

 (see Plate 16). It is certain at all events that at the 

 Kurrajong Heights two structures similar to but on a larger 

 scale than those at Lapstone Hill and Glenbrook make 

 their appearance, at a distance of about 15 miles northerly 

 from Glenbrook. 



It is clear that the Kurrajong monocline is a continua- 

 tion of the Lapstone Hill monocline, and as shown by 

 Plate 16, there is a strong probability that the Kurrajong 

 fault is a continuation and development of the Glenbrook 

 fold. 



The existence of the fault at the "Cut Hock," Kurra- 

 jong Heights was first suspected by me through viewing 

 from Woodford the general surface configuration of the 

 Blue Mountain Plateau. It was apparent that the bold 

 line of the Kurrajong Heights which bounded one's view 

 in an E.N.E. to N.B. direction marked a feature due to 

 some cause other than mere erosion, and was therefore to 

 be ascribed to folding or faulting. 



With a view of testing this opinion by direct observation 

 Mr. G. W. Card, Assoc. e.s.m., f.g.s., and I visited the Kurra- 



