516 NEW ZEALAND SOUND (AND LAKE) BASINS. 



Smith, W. S. Tangier — Some Aspects of Erosion in Belation to the Theory 

 of the Peneplain. Publications of the University of California. Geology. 

 Vol. ii. p.155, Oct. 1899. 



Tare, R. S. — The Peneplain. American Geologist, Vol. xxi. pp. 351-370., 

 June, 1S98. 



EXPLANATION OF PLATES. 



Plate xxxix. 



The Wollondilly (Upper Hawkesbury) Carlon at Wombeyan Crossing. 



The excessive youth of the canon is noticeable. The even sky-line in the 

 background is the 3,200 feet level excavated in a Palaeozoic complex. 

 Photo by R. H. Cambage. 



Plate xl. 



The Wooloomumbi Falls, showing inception of canons in New England. 

 The Falls are 900 feet high and the wall through which it discharges is 1,500 

 feet in height. Here a mature valley is giving place to a young canon. 



(This is a Hanging Valley, and almost the only one known to the author 

 in New England. The Chandler (right-hand stream in picture) and Wooloo- 

 mumbi formerly effected a junction along their mature valleys near their 

 present junction in the canon base. The Wooloomumbi in sinking its canon 

 discovered a local hardness, while the Chandler had no difficulties to 

 encounter. They have, however, only just become separated). 



Plate xli. 



View of Baker's Creek Gorge, Hillgrove, 1,500 feet deep. The sky-line 

 marks the dismantled Upland Valley (Miocene) Level. In this have been 

 excavated the mature valleys and the still later canons. 



