470 



THE GEOLOGY OF THE NF.W HEBRIDES, 



which are chie% glassy. Phenocrysts of smaragdite are still 

 discernible, though their sharp outline has been lost. 



TABLE OF ANALYSES. 



INDEX. 



i. Hypersthene andesite perlite; Leleppa Island, 

 ii. Basalt porphyrite (with felspar glomerules); Island of Mau. 

 iii. Basalt porphyrite, the dyke equivalent to No.ii.; from dykes and sills 



intersecting the agglomerates in the vicinity of Fatmalapa on the 



mainland of Efat^. 

 iv. Hornblende andesite; Wai Malikoliko, S. W. Santo. 



SUMMARY. 

 The chain of islands forming the New Hebrides group, owes its 

 existence, primarily, to the development during Miocene times of 

 a fold-ridge, apparently continuous with that passing around the 



* The colour of the fused cake was in all cases very faint, indicating 

 probably not more than 0-15% MnO; in order to save time, this was pre- 

 cipitated with the Fe203. 



