BY R0BP:RT L. jack, F.G.S., F.R.G.S. 71 



TooLEYBucK ( Juuctiou of Hamilton and Warburton Eivers) ; 

 also called Toolibune and Tooleybuck : — 



No. 1. — Depth, 917 feet. — Bore stopped in granite after 

 passing through blue shales. 



No. 3. — Depth, 817 feet. — Bore stopped in granite after 

 passing through blue shales. 



No. 4. — Depth, 456 feet. — Bore stopped in granite. 



No. 6.— Depth, 860 feet. 



Carandotta (Junction of Georgina River and Moonah 

 Creek). Over 1,006 feet. Unsuccessful; no uiformation as 

 to strata. 



The nearest bores in which overflowing water has been 

 struck are those on ^Yarenda run, extending, I believe, from the 

 head station on the Hamilton to Pollygammon Creek ; two 

 (Nos. 2 and 5) of the Tooleybuck bores ; and one at Llanrheidol, 

 six miles up Saville Creek. The Warenda bores are in the 

 vicinity of mud springs, the deepest (on Pollygammon Creek) 

 being 77 feet. No. 2 Tooleybuck bore is 531 feet deep and 

 " bottomed " on granite after striking an overflowing supply of 

 33,000 gallons per day. No. 5 Tooleybuck bore is 441 feet deep 

 and gives 20,000 gallons per day ; I have no information 

 regarding the strata. 



Regarding the structure of the Macdonnell Ranges in South 

 Australia we have some important information from the Govern- 

 ment Geologist, Mr. H. Y. L. Brown,'' the pith of which, for 

 the present purpose, is contained in a note by Mr. Brown to Mr. 

 Etheridge's Appendix (pages 12 and 13 of the 1891 Report). 

 Mr. Brown distinguishes three rock systems : (1) crystalline, 

 metamorphic, gneissic and granitic Archaean rocks ; (2) lying 

 unconformably on (1), quartzite, quartzite-conglomerate, 

 ■dolomitic limestone, limestone, sandstone, and slate, striking 

 east and west, " lithologically similar and doubtless of the same 

 [Cambrian] age " as the fossiliferous Flinders Range ; and (3) red 

 and pale sandstone, quartzite and shale with thin bands of lime- 

 stone, lying unconformably on (2) and also striking east and 

 west. These yield Lower Silurian fossils. 



* Reports on Coal-bearing Areas in neighbourhood of Leigh's Creek, etc. Adelaide : 

 By Authority : 1891, and Further Geological Examination of Leigh's Creek and Hergott 

 Districts, etc. Adelaide: By Authority: 1892. Each report contains a Palaeontological 

 Appendix by Mr. Robert Etheridge, junr. 



