BY PROF. DAVID, RICHARD HELMS, AND E, F. PITTMAN. 53 



they were far too much weathered to retain the original surface 

 of erosion, and those which did seldom exhibited any grooves or 

 scratches. 



In the case, howe\er, of one boulder, found by us in situ near 

 Porcupine Ridge, a small cut, apparently of glacial origin, was 

 noticed on its under surface. Marks were also observed on a few 

 blocks of similar rock at Thompson's Flat, but as the latter were 

 not in sihi and had been moved in the bed of a mountain creek 

 the evidence is not of much value. 



Amongst other rocks represented in these detrital deposits, 

 besides the prevailing granite, were felspar porphyries, basalt, and 

 mica schist, in addition to large subangular blocks of quartz ; 

 the largest seen, which bears about N. 10° W. from Pretty Point, 

 about half a mile distant, measuring 4 ft. x 4 ft. x 1 J ft. 



None of the blocks examined by us from the shallow prospecting 

 shafts near Pretty Point or Boggy Plains exhibited definite 

 glacial cuts or striae. 



With regard to the general evidence of a possible extensive 

 glaciation along the whole Kosciusko Plateau as far down as 

 Boggy Plains (the altitude of which is about 5,220 feet), great 

 caution should, in our opinion, be exercised in interpreting the 

 phenomena. The wide flats strewn with small and large boulders 

 and the smoothed granite rocks bounding such flats are very 

 suggestive of ice-action. If of glacial origin, they may have 

 been formed by ice choking up the Snowy Valley and seeking an 

 escape in an easterly direction into the watershed of the Cracken- 

 back River. 



One of us (Mr. Helms) has elsewhere advocated this view, and 

 is still of the same opinion, the evidence being gi^ en by him in 

 considerable detail in his paper to the Linnean Society of New 

 South Wales (7, pp. 3.H-356). 



Professor Lendenfeld had previously published a general state- 

 ment as to a former universal glaciation of the Kosciusko 

 Plateau. Two of us (Professor David and Mr. Pittman), while 

 admitting that there is nothing in the evidence inconsistent with 

 the interpretation put upon it by Mr. Helms and Professor 



