Trans. N.Z. Inst., Vol. LIIT. 



Plate XXVIII. 





Fig. 1. — Granulated (?) quartzite from conglomerate at Onerahi. Crossed nicols. X 25. 



Fig. 2. — Perthitic feldspar from gneissic granite from conglomerate at Onerahi. ( !roS3ed nicols. X 2.">. 



Fig. 3. — Plagioclase phenocrysts in granophyre from conglomerate at Onerahi. Crossed nicols. X 25. 



Fig. 4. — Granophyric matrix of rock' illustrated by fig. .'! above. Crossed nicols. X 133. 



Fig. 5. — Spherulitic structures in matrix of acidic (?) tuff from Onerahi conglomerate. Crossed 



nicols. X 133. 

 Fig. 6. — Quartz phenocryst from acidic (?) tuff from conglomerate at Onerahi. It contains rounded 



fragments of finely granophyric hornblende-feldspar rock. Crossed nicols. X 13:>. 



Face v. 128A 



