352 Geology of 



The specimens analysed were taken from the following localities : — 

 No. ISO Tufaceous lava, from a stream about 10 feet thick from 

 Lyttelton end. 

 218 Trachyte dyke, rapidly thinning out in the tunnel, 21^ chains 



from Lyttelton end. 

 234c Fragment from agglomerate bed No. 331, vesicular trachyte 

 section No. 1. 

 29b Trachyte dyke, from side, tabular jointing, section No. 5. 

 29a Same dyke, from centre. 



227 Phonolitic rock, fragment from an agglomerate bed, 16| 

 chains from Lyttelton end. 

 55 Porphyritic basalt, from a large stream, 42 chains from 



Heathcote Valley end. 

 41 Trachydolerite dyke, 18 feet thick, 13^- chains from Heath- 

 cote end. 

 183 Trachydolerite dyke, about three feet thick, 38i chains 



from Lyttelton end. 

 196 Porphyritic basalt, from a lava-stream about 10 feet thick, 

 section No. 2. 

 7 Scoriaceous dolerite, section No. 6. 

 28 Porphyritic dolerite, section No. 5. 

 23 Laterite, section No. 5. 

 191a Porphyritic basalt, from the centre of a small lava-stream, 

 about 7 feet thick, 35 chains from Lyttelton end. 

 10 Porphyritic basalt, section No. 6. 



51a Bole, partly altered to laterite, 40 chains from Heathcote 

 end. 



Analysis made at the Laboratory of the Imperial Geological Insti- 

 tute of Austria, Vienna, by Carl Hitter von Hauer. 

 Flaky vesicular trachyte. — Banks' Peninsula, from the large dyke near 

 the Bridle-path, in which Messrs. F. Thompson and Co.'s quarry 

 is situated {So. 29 of Tunnel Section.) 

 Silica ... ... ... 62-80 



Alumina 



Protoxyde of iron 

 Lime 

 Magnesia 

 "Water 



20-62 

 2-00 

 754 



•87 

 566 



9949 



