24 T. W. E. DAVID. 



(5) That recently hot springs, such as those of the 

 Douglas River have broken out along lines which trend 

 between N. 35° W. and N.W. 



We thus see in the Northern Territory evidence first of 

 a N. by W. foliation of the Pre-Oambrian rocks, followed 

 by a N.W. folding of the Cambrian strata, and this in turn 

 succeeded by a general tilting of all the strata from Cre- 

 taceous downwards in a S. by W. direction, showing that 

 this part of Australia has probably of late fallen under the 

 control of the New Guinea lines of uplift. Much informa- 

 tion on the subject of the tectonic lines of Northern 

 Territory may be expected from Dr. W. G. Woolnough on 

 his return from the Scientific Exploring Expedition in 

 Northern Territory. We may now turn to the south eastern 

 part of Australia, and review the tectonic lines of Tasmania, 

 Victoria, and New South Wales. 



Tasmania, — Mr. W. H. Twelvetrees, f.g.s., 1 and Mr. T. 

 Stephens, m.a.,* 2 and Mr. R. M. Johnston, f.g.s., 3 have 

 devoted some attention to the dominant trend lines. Mr. 

 Twelvetrees has shown that on the west coast of Tasmania 

 the schists of Pre-Oambrian age strike about N. 20° W., at 

 the Rocky River on the Waratah Corinna Road, and at 

 Cox's Bight on the south coast Pre-Oambrian (Algonkian) 

 biotite schists and quartzite strike N.N.W. to N.W. They 

 dip at low angles to the S.W. Mr. Twelvetrees estimates 

 a minimum thickness for these beds of about 13,000 feet. 

 On the N.W. coast at Rocky Cape quartzites and quartz- 

 schists (Algonkian) trend N. and S., or a little W. of N., 

 and E. of S. At the Forth River micaceous schists, horn- 

 blendic schists with garnet and zoisite, and quartzites 

 strike W. of N. with a westerly dip. 



1 Rep. Austr. Assoc, for Adv. of Sci., Vol. xi, 1907, pp. 466 - 470, and 

 ibid., Vol. x, 1904, pp. 613 and 622-630. 



2 Proc. Linn. Soc. N. S. Wales, Vol. xxxiii, pt. iv, pp. 752-767, pis. 

 xxiv - xxviii. 



3 Geology of Tasmania, by R. M. Johnston, f.g.s., etc. By authority, 

 Hobart, 1888. 



