president's address. 551 



This belt of metamorphic rocks is from 10 to 30 miles wide as 

 described by the lale Mr. Hardman"*^, and at least 120 miles in 

 length. 



Mr. Hardman describes! the metamorphic rocks of part of the 

 Kiiuberley District as consisting of mica-schist, andalusite schist, 

 epidote rock, chlorite schist and talcose schist, and at Bald Rock, 

 one mile N.E. of Mount Philip, he mentions a j»ink granite 

 containing much olivine, a truly remarkable rock, if the descrip- 

 tion of it be correct. Its relation to the Archsenn (?) rocks of 

 that district is not known. 



As for as I can gather, no actual junction line has as yet been 

 observed between the Archaean rocks and the Olenellus and S alter ella 

 rocks, so that the classification is provisional only, as the schistose 

 and gneissic rocks may represent portion of the Cambrian rocks 

 highly metamorphosed. That there should be Archaean rocks, 

 however, in a district wliere there is a considerable development of 

 fossiliferous Lower Cambrian rocks associated with a highly 

 metamor[)hic series is more than probable. 



At the Kimberley District, therefore, there must have been 

 either land or shallow ocean in Pre-Gambrian time. 



(5) In Tasmania certain rocks on the west coast and in the 

 north and north-east portions have been described by Mr. R. M. 

 Johnston, F.CS.J, &c., as being probably of Pre-Cambrian Age 

 on the evidence of an apparently strong unconformity between 

 them and the rocks of the Upper Cambrian Series in the Mersey 

 District of that island. 



The rocks consist of quartzites, tourmaline quartzites, sand- 

 stone, conglomerate, mica-schist, chlorite schist, gneiss, crystalline 

 granular amphibolite, granite, topaz-porphyry, diallage rock and 



* Report on the geology of the Kimberley District, Western Australia, 

 by Edward T. Hardman, F.R.G.S.I., Assoc. Roy. Coll. Science, Dublin. 

 By authority. Perth, 18S4, p. 21. 



+ Loc. cit. p. 10. 

 X Geology of Tasmania, by R. M. Johnston, F.G.S., &c., pp. 16-32. By 

 authority. Hobart, 1888. 

 38 



