32 president's address. 



system which brings us down mostly behind rochy hiyhlands 

 to Stockton Beach. A glance at a map of the coast shows 

 that this particular section of it protrudes as a bulge beyond 

 the general line of the shore to the north and south, and it 

 is in this section only that I recognize at all clearly the 

 features of valley formation described above. Certain gravel 

 deposits, ('.<!■, on the Lower Manning require careful investi- 

 gation. At the present stage all I do is to throw out the 

 suggestion of a very ancient and highly mature coastal valley 

 parallel to our coast line, of which the feature I have 

 sketched above is the imperfect fragment. ' ' 



The projection from the main coast line which Dr. Wool- 

 nougli describes above is repeated on a small scale by the 

 headlands of Jervis Bay. In this connection it is interesting 

 to note that Mr. Taylor drew attention to the low land within 

 and the possibility of that area being a segment of a former 

 valley* Perhaps the last stage in dissolution of a marginal 

 valley is represented by Jervis Bay. 



The process lately commenced in the case of the Shoal- 

 hawke of being broken into lengths by cross streams, the in- 

 evitable doom of the marginal, has advanced in the Macleay- 

 Port Stephens Valley so far as to almost obliterate its 

 course. The longer time required for its greater denudation 

 indicates the antiquity of the Northern valley. We have 

 here also a suggestion of the existence of considerable land 

 to seaward which has since disappeared. 



Fig. 6. — Profile from Mount Warning on the left, by way of Southporb, 

 to a point 28° 16' >S. lat., 155° 36' K. long., and thence to 28° 52'. 8. lat., 

 156° 11' E. long., showing the Britannia Ridge rising to 220 fathoms, 

 from a depth, on the west of 2,650 fathoms, and, on the east,' of 2,832 

 fathoms. 



* Taylor, " Physiography of Federal Territory," 1910, p.ll. 



