566 



Transactions. 



folding movements as the surrounding rocks, or whether the 

 mass is an intrusion formed subsequent to the main rock-move- 

 ments of the region. The apparent abrupt change on the last 

 from lherzolite to schist, and the gradual change of rock-type to 

 the west, seem to support the former view. At any rate it is 

 apparent that here there is abundant material for studying the 

 differentiation of a magma from which rocks varying from diorite 

 to lherzolite have crystallized. However, the exceeding remote- 

 ness of the locality, the roughness of the country, and the great 

 difficulty of obtaining supplies render it unlikely that the dis- 

 trict will be revisited for some time, hence it was considered 

 advisable to place on record even these vague and ill-deter- 

 mined facts. 



Alluvial and moraine. 



Te Anau bre^-i. 



Diorite 



Cabbro. 



Pyroxenite. 



Partially serpentin 

 ized lherzolite. 



Dark serpentinized 

 dunite. 



Lherzolite. 



Schist. 



— — — — • Probable boundary of 

 lherzolite. 



Dip vertical. Strike N. 10' E 



The probable transition from the peridotite type to gabbro 

 was already supposed by Professor Ulrich, from information 

 supplied by Butement, who had gathered it from observations 

 made nearer the coast-line. 



