514 H, 8. JEVONS, H. I. JENSEN, T. G. TAYLOR AND C. A. SUSSMILCH. 



Survey of New South Wales, the quantity of biotite stated 

 as present being an assumption, though Mr. Card's descrip- 

 tion mentions biotite as "fairly abundant," and the working 

 of the analysis seemed to give about two and seven per 

 cent, as the extreme limits possible for it. This specimen, 

 which we may call the " Survey specimen," would not have 

 been included except for its interest as a highly felspathic 

 variety. 



I. II. III. IV. V. VI. VII. 





.*> cm. 



30 cm. 



450 cm. 



500 cm. 



400 cm. 

 900 cm. 



15C0 cm. 



If- 00 cm. 





L. 



Emu 

 Quarry. 



B. 



Reservoir 

 Quarry. 



C. 



Centre 

 Reservoir 

 Quarry. 



P 



Emu 

 Quarry. 



Survey 

 Specimen 



Emu 

 Quarry. 



Coarse 



Aplite 



Reservoir 



Quarry. 



I. 



N.W. of 

 Reservoir 

 Quarry 



Felspar 



37- 



39- 



45 



50 



56- 



78- 



38 



Augite 



33- 



30- 



34- 



28 



20- 



16 



38- 



Olivine 



21 



14 



8 



4 



7 



nil 



5- 



Iron ores ... 



7- 



4 



3- 



14 



11- 



5 



16 



Biotite 



0- 



11- 



7 



2 



3- 



nil 



1- 



Apatite 

 (Orthoclase) 



.1 

 n.d. 



1.0 

 1 



.1 

 n.d. 



2.0 

 cl5 



.7 

 5 



.7 

 18 



.4 

 2- 



In the table the specimens have been set from left to 

 right in the order of their distance from the overlying 

 junction of the intrusive rock with the shales, that distance 

 being always measured in the nearest direction, and, for 

 convenience of comparison, uniformly stated in centimetres. 

 In the case of the Survey specimen only the limits can with 

 any certainty be given, conditioned by the facts that the 

 rock is not aphanitic, and that the maximum depth of the 

 Emu Quarry below the junction is nine metres ; but it 

 seems probable that it came from the lower part of the 

 quarry, which would bring it over seven metres below the 

 junction. The specimens do not unfortunately form a con- 

 tinuous series taken in a vertical direction under one point, 

 the inaccessibility of the quarry faces and the irregularities 

 of weathering rendering this practically impossible. That 

 they come from widely separated parts of the mass does not 



