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main road to Arthurton. A conspicuous dyke of schorlaceous 

 pegmatite is seen on the opposite side of the road running 

 north and south. The country for some distance on botli 

 sides of the valley, and southwards to Dinham's quarries, is 

 a continuous belt of igneous and metamorphic rocks, pegma- 

 tites alternating with gabbro and other basic dykes, pene- 

 trating micaceous, hornblendic, and schorlaceous schists, the 

 latter being vertical, or nearly so. 



(a) In a northerly direction the outcrops were traced 

 through Sections 87 and 88. 



(b) A costeen pit situated on, or about, Section 275, on 

 south side of main road, showed talcose and schorlaceous 

 schists to a depth of 4 feet, with a north and south strike, 

 and dip 85° east; flanked on the western side by a strong 

 dyke of pegmatite. 



(c) Another costeen pit, situated on, or about. Section 

 277, 100 yards to the south-east of the preceding, gave a 

 strike north-north-east and south-south-west, the beds being 

 in vertical position. 



(d) At old shaft, on Mr. Dinham's land, situated on 

 south side of road, a little west of the Government Reservoir, 

 the surface dumps showed talcose and chloritic schists passing 

 into quartzite. 



(e) At the back of Mr. Dinham's house a dyke of gabbro 

 forms the bed of the road. 



(f) At Mr. Allison's farmstead, situated on Section 97, a 

 well, at the time of my visit, was being sunk near the district 

 road, which gave the section — 20 feet of red clay, 1 foot of 

 coarse quartz grit with fossiliferous nodules from the Tertiary 

 beds, and 4 feet of decomposing mica schist. 



(r/J Government bore, put down in Section 83, situated 

 5 miles west of Ardrossan, proved granite after passing 

 through alternations of clay and gravel to a depth of 106 feet. 



2. Hart's Mine. The mine is situated on the sea cliffs, 

 a little further south than Muloowurtie Point, 8 miles from 

 Ardrossan. The cliffs form a remarkable exposure of Pre- 

 Cambrian rocks, mostly plutonic, and are highly coloured. 

 The rocks are largely felspathic, large portions consisting 

 exclusively of a massive pink felspar, which passes in places 

 into a quartz-felspar rock, the quartz occurring in long 

 crystals sporadically distributed through the felspar, and 

 approaches a graphic granite. Much of the rock is coloured 

 green, probably an epidote-syenite, and is also chloritic, in 

 part. The syenite, in one place, was penetrated by a vein of 

 ilmenite 2 inches in diameter. Crystals and nests of tourma- 

 line occur, and a large rock consisting entirely of actinolite 

 and tremolite lay upon the beach. These basement rocks are 



