Geology of Castleiname, &c., ivitJi List of Minerals. 57 



not having been previously recorded from Victoria. These 

 minerals were accompanied by crystals of orthoclase and smoky 

 quartz. Iron and copper pyrites occur in small patches associ- 

 ated with minerals derived from them by alteration. I have also 

 noted garnet and schorl from this locality. Jointing is well 

 marked and, in the quarry, is very regular. One set of joints 

 strikes E.5°N., another about north, both being neai'ly vertical ; 

 while a third set, fomning the "floor" of the quarry, "dips" at 

 an angle of about 20" to the westward. The exact agreement of 

 the north striking joints, with the strike of the silurian rocks, is 

 peculiar. 



Near the silurian boundary, the character of the rock is more 

 varied, and may be well studied near the Expedition Pass 

 Reservoir, where the Sutton Grange Road passes through a 

 cutting in the silurian almost on tlie boundary. Hei'e, numerous 

 granitic veins, of very varied character, may be seen cutting 

 tlirough the sedimentary rocks. Schorl is abundant, but good 

 crystals are rare. Graphic granite is common, and tine speci- 

 mens may be gathered of all degrees of texture. Lej^tynite also 

 occurs, containing occasionally garnets of small size. Altogether 

 the road-cutting in al)Out tifty yards shows about a dozen dykes, 

 varying from twenty feet to a few inches in thickness. The 

 largest dyke consists of ordinary grey granite much decomposed. 

 Another contains large plates of white mica and orthoclase 

 crystals an inch and a lialf in length, the quartz being much 

 larger. One aplite dyke, five inches in width, can be traced for 

 about twenty yards with a strike S.40°E. The dip and strike of 

 tlie silurian rocks here is normal. Another locality, where the 

 junction may be studied, is in the road cutting under the railway 

 bridge at Harcourt, where similar features are shown. At the 

 point where the lai'ge water-race from the Coliban passes the 

 junction at Elphinstone, the sui'face soil is too deep f(:)r observa- 

 tions, other than that afforded by change in colour, to Ije made. 

 The spot is about one hundred yards south of the point where 

 tlie Bendigo railway crosses the race, and may Ije seen from the 

 ti-ain. At Maldon, north of the brewery, the actual contact may 

 be seen in a creek section. Here the ci-umpled silurian rocks dip 

 into the granite which is seen to over-lie them for several feet, 

 liaving evidently been forced there while plastic. 



