1^8 THE GEOLOGY OF TASMANIA— THE PRE-CAMBRIAN. 



III. On the northern coast-line, at TJlverstone, a 

 complex series of the schistose sediments and quartzites- 

 described above is to be seen (i). These rocks extend 

 eastwards as far as Button's Rivulet, and westwards to 

 the middle of Barkworth's Bay, west of Goat Island. 



On both sides the schists are bounded by Tertiary 

 basalt. 



At the mouth of the Leven River the strike is, on 

 the average, about N. lodeg. E,., while to the west of 

 Goat Island it ranges from N. I2deg. E. to N. 3odeg. 

 E. The dip is to the north-west. 



IV. Between Jacob's Boat Harbour and the Deten- 

 tion River, on the northern coast, there are found 

 quartzites and quartz-schists (2). Rocky Cape is built 

 up of massive bedded quartzites, which extend a mile 

 and a half southwards beyond the main road. 



At Rocky Cape port the bedded quartzites strike N. 

 of E., and the contorted quartz-schists which succeed 

 tbem on the west strike N. Sodeg. E. At Jacob's Boat 

 Harbour the strike is N.W., and the dip towards the 

 N.E. 



The southern extension of these rocks is covered by 

 Tertiary basalt. 



V. A narrow belt of Pre-Cambrian rocks has been 

 observed at the junction of the Whyte and Rocky 

 Rivers, crossing the Waratah-Corinna road (3). This 

 road, between points distant from Waratah 19 miles and 

 315'^ miles, traver&es the belt referred to diagonally. 

 However, the observed width of these rocks is only 

 about four miles. 



The Rocky River schists are amphibolites, some- 

 times compact and granular, sometimes distinctly schis- 

 tose, flanked on either side by schistose sediments. 



(i) Geological Survey of Tasmania, Bulletin No. 5, 1909. 



(2) See W. H. Twelvetrees' " Report on the North-West 

 Coast Mineral Deposits," 1905. 



(3) See W. li. Twelvetrees' " Report on the ]\Iineral Fields 

 between Waratah and Corinna," 1900. 



