Quart. Journ. Geol. Soc. Vol. LXX, Pl. XXXIX. 



}*m ■ 



2. * 30 



3. x ioo 



.- ■■■/ 



W. R.W., Photomicro. 



Bemrose. Collo, Derby 



CORDIERITE-GARNET-BIOTITE ROCK; HORNBLENDE- ANDESINE ROCK; and 



CORDIERITE-NORITE. 



