Quart. Journ. Geol. Soc. Vol. LXll, Pl. V. 







v 



'*Ltr-M 



Millimetres 



Millimetres. 



. 



Millim. 



Milhms 



ROCKS FROM THE RIO MADEIRA. &c. 



/. IV. E. &> T.C.. Photomicro. 



Millimetres 



Be> 



