A1)|)II'I()N»\I, COMMKN'l-S ON 'IIIK (; KOI. GOV OV 'IIIF. JTAX FKKNANDKZ ISLANDS 65 



Fig'. 22. Vesicular phyric feldspar basalt with stray phenocrysts of olivine, x 30. Analysed spe- 

 cimen from I 420 m elevation. Masafuera. 



Fig. 23. Aphyric feldspar basalt. Columnar structure, x 50. Elevation c. 150 m. 



El Ovale, Masafuera. 



