154 T. W. E. DAVID. 



DISCOVERY of GLACIATED BOULDERS at BASE op 



PERMO-CARBONIFEROUS SYSTEM, LOCHINVAR, 



NEW SOUTH WALES. 



By Professor T. W. E. David, b.a., f.g.s. 

 [With Plate IV.] 



[Read before the Royal Society of N.S. Wales, October 4, 1899. Date of final 

 receipt October 25.] 



The late Government Geologist of New South Wales, Mr. C. S. 

 Wilkinson was the first, as far as I am aware, to recognise 

 evidence of ice action in the above district. The evidence observed 

 by him was of the nature of large erratics of quartzite, slate, 

 granite, etc., imbedded in a mass of fine sandy shales containing 

 a rich marine fauna of Permo-Carboniferous affinities. 



The locality where Mr. Wilkinson observed these evidences was 

 on the main Northern Road between Branxton and Black Creek, 

 and about eight miles distant from the spot near Lochinvar where 

 glaciated boulders have been recently discovered. Although, as 

 far as I am aware, Mr. Wilkinson did not publish any reference 

 to glacial action in New South Wales further than his paper on 

 supposed glacial action in the Triassic Hawkesbury Series, 1 he is 

 yet entitled to a considerable share in the discovery, as it was his 

 observations and verbal information which led Mr. R. D. Oldham 

 and myself to this district where striated pebbles were subse- 

 quently found. 



In 1885 Mr. R. D. Oldham, Assoc, r.s.m., Senior Superintendent 

 of the Geological Survey of India, visited the erratic horizon near 

 Branxton, and was fortunate enough to discover a pebble faintly 



l Journ. Eoy. Soc. N. S. Wales, Vol. xin., 1879, pp. 105 - 107.— " Notes 

 on the Occurrence of Eemarkable Boulders in the Hawkesbury Eocks. 



