150 PROCEEDINGS OP THE ROYAL SOCIETY OF QUEENSLAND. 



of a chemical nature has become available as the result of 

 analyses of the "Grey Phase'' and the Greymare rock. 

 The first of these (E4) was found to resemble certain 

 analyses of the "basic granites" very closely, and did not 

 resemble those of any other of the Phases. 



Of these ' ' basic granites, ' ' Andrews writes : — ' ' Striking 

 dissimilarities in appearance is a marked feature. "-^ The 

 analyses which accompany his descriptions emphasise this 

 feature. Of the four quoted, tAvo are comparatively acid 

 and have alkalies in moderate amount, the K^O being in 

 excess of the NaoO. These obviously have little in common 

 with the "Grey Phase." They seem, indeed, to be more 

 closely related to the coarse-acid granite that immediately 

 followed them, for Andrews remarks that the more-basic 

 types were somewhat earlier and the remaining two analyses 

 are of this earlier more-basic type. They are of very 

 different rock types from the others, and possess the 

 essential characteristics of the Grey Phase, as can be seen 

 by their positions (N.7 and X.8) on the variation diagrams. 



No analysis exists as yet of the "Maryland" granite,, 

 which, however, is considered by Mr. Card-- to be an 

 Adamellite. It is "a fine to medium-grained greyish-blue 

 rock." Saint-Smith,^^ in his chapter on the "Maryland" 

 granite refers to one other rock which he says "resembles 

 the Maryland granite to such a marked degree in liand- 

 specimens that it may ultimately prove to represent an 

 outcrop of this rock." This is the "Greymare" granite 

 which has since been analysed (S.4.) This analj^sis, while, 

 considerably more acid, resembles those of the" Grey Phase" 

 on the one hand and "Basic Granites" on the other in 

 several important particulars, particularly in the prepon- 

 derance of NaoO over KgO. 



The Grey Phase seems then to be connected indirectly 

 (through the Greymare granites) with the IMaryland 

 Adamellite and directly with the ■"Basic Granites" of New- 

 England. 



If chemical tests be applied it will be found that the 

 results confirm very strongly the above correlations. 



-' Op. at., p. 212. 



"Min. Res. N.S.W. No. 14, p. 91. 



"Op. Cit, p. 61. 



