Trans. X.Z. Inst.. Vot,. Xl.VII! 



Plate VI. 



*r 



Fig. 1. — Greywacke with ar^illite inclusions, Makara Valley; polished slab. 



I*-.. 



Fig. 2. — Gi>"jn aiyillile, partly reddened; polished slab. 



JPace p. 7S.] 



