626 THE GEOLOGY OF THE WARRUMBUNGLE MOUNTAINS. 



Fig. 3. — Arfvedsonite Tr8.chyte(W. 215), Scabby Rock, showing microgranitic 



almost orthophyric structure. Nicols crossed. 

 Fig.4.— Trachytic .^.girine-Trachyte (W.109), Gibb's Gap, near Naman. 



Nicols crossed. 

 Fig.5. — Dark .Egirine- Trachyte (W. 9), Timor Ledges, with an wgirine 



crystal near the centre of the field. Nicols uncrossed, 

 Fig, 6. — DarkPorphyritic .Egirine-Trachyte-Andesite or Keratophyre(W.22), 



Nandi Mountain, showing a dark mass of pseudobrookite and two 



microline microperthite phenocrysts. Nicols crossed. 



Plate xxxi. 



Fig.l. — Nosean Pseudoleucite Phonolite (W. 222), Bingy Grumble. Nicols 

 uncrossed ; showing the femic minerals crowding round the 

 felspathoids (nosean, etc.). 



Fig.2. — Same as fig. 7. Nicols crossed; showing black patches of isotropic 

 nosean and pseudospherulitic aggregates of felspar microlites with 

 interstitial analcite. 



Fig.3. — Nosean- Arfvedsonite Leucitophyre, Berum Buckle. Nicols un- 

 crossed. Notice the crystals of pseudoleucite. 



Fig.4. — Same as fig. 9. Nicols crossed. Note the trachytic and flow- 

 structure of the base. 



Fig.5. — Orthoclase-Basalt (W.67), The Spire, showing coarse-grained 

 gabbroic inclusion adjoining fine-grained base of trachydolerite 

 composition. 



Pig. 6. — Xenocryst of Labradorite studded with magnetite inclusions in 



W.67. 



Plate xxxii. 



Fig.l. — Xenocryst of Labradorite with inclusions in trachydolerite (W.85). 

 Fig.2. — Meliphanite Basalt (W. 58), Mt. Gowang. Nicols uncrossed. 

 Fig.3. — Same, Nicols crossed; showing a portion of the base crystalline in 

 outline, and composed of similarly oriented felspar microlites. 



The following three figures belong to the Paper on the Geology of the 

 Nandewar Mts., to appear later. 



N.l. — Perlitic Pitchstone (N.62), Boggabri. Nicols uncrossed. 



N.2. — Dolerite (N.17), Dingo Creek; the extinguished crystal is augite, the 



small bright crystal near it is olivine. Nicols crossed. 

 N.3. — Solsverbergite (N.S), Bullawa Creek, showing microperthitic felspar 



phenocrysts. Nicols uncrossed. 



[Printed off October 23rd, 1907.] 



