Park. — Striated Erratic Block of Andesite in Rangitikei Valley. 135 



Art. XV. — On the Occurrence of a Striated Erratic Block of Andesite in the 

 Rangitikei Valley, North Island, New Zealand. 



By Professor James Park, F.G.S., Otago University. 



[Read before the Otago Institute, 7ih December, 1915.] 



Plate XIV. 



In 1909 I described* the occurrence of several massive piles of andesitic 

 blocks in the middle and lower portions of the Hautapu Valley. The source 

 of this andesitic material is Mount Ruapehu ; and the significance of the 

 occurrence lies in the fact that the Hautapu River does not reach within 



Sketch Map of 

 Hautapu Valley. 



Show tng position of Tnaxn. piXes 



hfand^sitic blocks ouvi MangcLyvska, 



strtoieiZ erratic. ■ 



Utiku qo, 



Tiles of ojidesUvc blocks . . U£°o°.l 

 ScaZe ofMtles 



g-v ^S^ Mangaweka 



StrUxted^ erratic/ 



many miles of Ruapehu, but is separated from that mountain by the 

 Wangaehu Valley. The Wangaehu rises on the eastern slopes of Ruapehu, 

 and flows southward through a wide valley fringed on both sides with high 

 terraces. 



* J. Park, " Glaciation of Hautapu Valley," Trans. N.Z. Inst., vol. 42, p. 577. 



