1873. j hutton — younger formations op new zealand. 375 



Oligocene Period. 



Number of species determined ' 69 



„ of recent species 15 



„ passing up into the Miocene formation 24 



„ passing down into the Eocene formation 15 



„ confined to the formation 31 



Percentage of recent species 21 



Upper Oligocene or Hawke's-Bay Group. 



Number of species determined 55 



„ of recent species 11 



„ passing up into the Kanieri group 13 



„ passing down into the Waitewata group 11 



,, confined to the group 21 



Percentage of recent species : 20 



Localites. — North Island : Napier ; " Taipos " on the east coast 

 of Wellington Province ; Castle Point ; Waitotara. South Island : 

 Hurinui Mound ; Trelissick (upper series) ; east side of Te-Anan 

 Lake. 



References. — Crawford, Trans. N. Z. Inst. ii. 343 (5 in part, Lime- 

 stone). Hector, Geol. Reports, 1870-71, p. 158 (groups 1 and 2) ; 

 ibid. p. 160 (a, b, and o). Hochstetter, New Zealand, 1867, p. 61 

 (Hawke's-Bay series, b, f). Hutton, Geol. Reports, 1871-72, p. 99 

 (Middle Tertiary, g in part). 



Remarks. — In the North Island this group is chiefly calcareous, 

 but in the South Island it consists of clays and sandstones, The 

 following South-American Miocene shells occur in it, viz. Natica 

 solida and Oucullcea alta. 



The Tertiary beds of the Chatham Islands (Haast, Trans. N. Z. 

 Inst. i. p. 180, 2, 6 and 7) belong also to this group : in them a well- 

 marked species of Gryplicea occurs. 



Lower Oligocene or Waitewata Group. 



Number of species determined 26 



,, of recent species 6 



„ passing up into the Hawke's-Bay group 11 



,, passing down into the Ototara group 11 



„ confined to the group 6 



Percentage of recent species 23 



Localities. — North Island : Auckland ; Kawau ; Cape Eodney. 

 South Island: Trelissick (lower series); Waitaki; Limestone of 

 Lake Wakatipu. 



References. — Heaphy, Quart. Journ. Geol. Soc. 1860, p. 242 (7). 

 Hector, Geol. Reports, 1868-69, p. 47; Q. J. G. S. 1865, p. 128 

 (iv. 3). Hochstetter, New Zealand, 1867, p. 60 (Waitewata series, a). 

 Hutton, Trans. N. Z. Inst. iii. p. 249 (Waitewata series). 



RemarJcs. — In the North Island this group consists almost entirely 



