Hamilton. — On the Foraminifera of the Tertiary Beds at Petane. 393 



tain amount of the pressure, still it is quite certain that all the lower 

 portions of the dykes must have been formed under great pressure ; but 

 yet, — so far as I have been able to judge, with the exception of the dyke 

 under consideration, — the stone has the same appearance whether taken 

 from the upper or lower part of the dyke. 



The commercial value of this dyke, with its cap, is very considerable. 

 From the number of parallel joints stones with two beds can be obtained of 

 almost any size, and the softer portions can be used for all purposes for 

 which cut stone is required. 



Description of Eocks. 



1. Porphyritic dolerite lava stream with crystals of labradorite. 



2. Trachyte from dyke at west edge. 



3. Trachyte from dyke at centre decomposed. 

 4.\ 



5. -Basaltic tufas red and grey. 

 6.) 

 7. & 7a. Compact basalt showing somewhat globular structure 



8. Trachyte dyke partly decomposed. 



9. Porphyritic basalt. 



10. Ditto 



11. Dolerite lava with crystals of labradorite. 



12. Trachyte. 



13. Trachyte with crystals of sanidine. 



14. From the top of the cap. 

 1*1 



Art LVI. — On the Foraminifera of the Tertiary Beds at Petane, near Napier. 



By A. Hamilton. 

 {Read before the Wellington Pliilosophical Society, 24:tJi July, 1880.] 

 During the past year I have been collecting the fossils which occur so 

 plentifully in the tertiary beds to the north of the inner portion of Napier 

 harbour to determine their true age and position. When the fossils have 

 been exammed and tabulated, I hope to lay the results before you, but as 

 Mr. G. E. Vine, junior, of Sheffield, has kindly forwarded to me some very 

 interesting and valuable information concerning the Foraminifera occurring 

 in these beds, I hasten to communicate the result of his examination of a 



60 



