GEOLOGICAL FAULT AT KURRAJONG HEIGHTS. 359 



after the removal of the iron by litharge; the cobalt was 

 determined by the potassium nitrite process. 



It was found very difficult to prepare a sufficiently thin 

 section of this meteorite for the preparation of the micro- 

 photograph (See Plate 12, fig.- 14) on account of its opacity 

 and the tendency for the nickel-iron alloy to tear out dur- 

 ing the grinding. The irradiation in the photograph is due 

 to light getting through the apertures thus left ; the white 

 spots without structure indicate these holes. The amount 

 of nickel-iron alloy present and its composition have yet to 

 be determined. 



Note. — The microscopic examination of the foregoing 

 meteorites is not yet completed. 



AN IMPORTANT GEOLOGICAL FAULT AT KURRA- 



JONG HEIGHTS, N. S. WALES. 



By Prof. T. W. Edgworth David, b.a., f.g.s., f.r.s. 



[With Plates XVI., XVII.] 



[Read before the Royal Society of N. S. Wales, December 3, 1902."] 



The fault described in this paper is intimately related to 

 the structural feature, a monoclinal fold, which forms the 

 eastern escarpment of the Blue Mountains. As far as I 

 am aware, the first reference to this from a scientific point 

 of view is that by Darwin. 1 



Darwin was of opinion that the eastern escarpment of 

 the Blue Mountains, " where it abruptly terminates over 



1 Geological Observations on the Volcanic Islands and parts of South 

 America visited during the voyage of H.M.S. " Beagle/' Second Edition, 

 pp. 146 - 154, and specially pp. 149 - 150. 



