670 GEOLOGY OF SAMOA AND THE ERUPTIONS IN SAVAII, 



General Remarks — Petrologically, the Samoan rocks are very- 

 like one another, and the basalts near Auckland, New Zealand. 

 The olivine content varies from nil to nearly 50%. Most of the 

 rocks are hypohyaline, if obtained from a depth beneath the 

 surface of a flow; hyaline or hemicrystalline, highly vesicular or 

 scoriaceous when obtained near the surface. The earlier rocks 

 erupted were probably augite andesites, the later ones being 

 olivine basalts. The new flow is richer in iron ores than any of 

 the old flows. 



Works useful for Reference. 



Dana, J. D. — "Characteristics of Volcanoes." 



"Geology of the United States Exploring Expedition." 



Lister, J. J. — " Geology of the Tonga Islands." Quart. Journ. Geol. Soc. 



Vol. xlvii., 1891. 

 Mawson, D. — "Geology of the New Hebrides." These Proceedings, 1905, 



p.400. 

 Woolnough, W. G. — "Continental Origin of Fiji." These Proceedings, 



1903, p. 457. 

 Smith, S. Percy — " Geological Notes on the Kermadec Group." Trans. N. Z. 



Inst. Vol. xx. 

 Thomas, Prof. A. P. — " The Eruption of Tarawera," published by the N.Z. 



Govt, in 1888. 

 Jensen, H. I. — "Possible Relation between Sunspots and Volcanic and 



Seismic Phenomena." Journ. Proc. Roy. Soc. N. S. Wales, Vol. 



xxxvii. 



EXPLANATION OF PLATES. 



Plate liv. — View of the volcano. 



Plates lv., lvi., lvii. — Building of lava peninsula. 



(Plates liv. -lvii. are from photos by Captain Allan. 

 Plate lviii. — View from summit to the sea. 

 Plate lix. — Lava running into the sea (from the land). 

 Plate lx. — ,, ,, ,, ,, ,, 



Plate lxi. — Papalaulelei flow. 

 Plate lxii. — Flow, Aa type. 

 Plate lxiii. — Tofua crater lake. 



