from 55 - 60°, strike from north 10° east to north 15° east. 

 There was no recognisable change in the lithology of the 

 beds, the dominant type was a quartzite or granulite, in 

 beds up to 200 feet thick, interbedded with slates, phyllites, 

 mica- and garnet-schists. Probably :i more detailed survey 

 will establish the existence of many definite horizons. 



! Rocks.— The Granites.— As stated above 

 the island is, so to speak, buttressed by large batholiths of 

 granite. On the western coast at least six separate masses 

 were examined, and one on the south-east coast at the 

 mouth of the Grassy River. All these have intruded the 

 Palaeozoic rocks, but no evidence as to their age is forth- 

 coming. They resemble the Tasmanian Devonian granites 

 strongly, and we may provisionally assign that age to them. 

 They are certainly old granites and have been subjected to 

 some of the dynamic metamorphism which has affected the 

 whole region, for not only are the felspars much altered 

 and saussuritized, but the <juart/ irives a wavy extinction, 

 and there is a large development of sericite. The west 

 coast granites are all grey biotite granites, with accessory 

 muscovite. The granite at the mouth of the Grassy River 

 is a light red rock with abundant pink orthoclase, biotite 

 not so prominent. 



In all the junctions examined the granites appear to have 

 intruded the slates without much mutual alteration. In 

 one case the granite has spread into the bedding planes of 

 the slates forquite a long distance, so that we get alternate 

 laminae of slate and granite. Large pegmatite veins 

 extend into the slates from the granite masses, one of which 

 was m ensured as extending to a distance of one and a quarter 

 miles from the surface outcrop of the parent mass. The 

 pegmatites are in places very coarse, masses of pure felspar 

 as large as eighteen inches through being measured. The 

 constituent minerals are chiefly quartz and orthoclase, with 



