or of the peculiar character shown Uy quartz replacing the 

 olivine of peridotites. Fragments of chert also are present 

 and grains of plagioclase. This is all set in a very finely 

 granular aggregate, probably of kaolin and carbonates. 

 This is dark and cloudy, and is dusty with very hue black 

 opaque particles. Chlorite (pennine) is also present. Cal- 

 cite forms veins through the rock, but some areas may 

 represent limestone fragments. The plutonic inclusions in 

 it are rare. I have noticed, as before mentioned, a peri- 

 dotite containing fresh olivine and flaky pyroxene(wehrlite?), 

 also a rock which resembled a gabbro, but proved to be 

 composed of chlorite (much oxidised) replacing pyroxene, 

 and carbonates possibly after olivine. In this were a few 

 quite undecomposed grains of diopside and olivine. There 

 was no spinel. A tiny flake of serpentine was found, about 

 the size of a finger-nail ; on sectioning this proved to be 

 antigoritic, and very like the Gundagai serpentine in some 

 respects. It is composed of large flakes of antigorite of a 

 pale yellow-green in colour, rather twisted and stained, 

 set in ground mass of little flakes of serpentine arranged 

 nearly perpendicularly to one another — the "knitted" 

 structure generally, though not always, indicating deriva- 

 tion from a pyroxene. 1 In addition there is also a large 

 mass of finely dusted magnetite, occuring in irregularly 

 bounded areas and several large compact grains. 



A very interesting inclusion of essexite was found, only 

 just sufficient to allow of a section being made. It is fairly 

 decomposed. The predominate mineral is plagioclase 

 (labradorite) in tabular crystals. It is decomposing with 

 the formation of chlorite. In very much smaller amount 

 is orthoclase in dull decomposed tabular crystals. The 

 ferromagnesian minerals were varied. The most abundant 

 is biotite in large flakes with a strong pleochroisra ranging 



1 Professor Bonney and Miss Raisin, Quart. Jour. Geol.Soc. 1905, p. 700. 



