Prof. J. Park — Tertiaries and Cretaceous, New Zealand. 543 



The complete succession of the two series is given below — 

 Lower Tertiary. Upper Cretaceous. 



1. Calcareous sandstone (Ototara 1. Greensands. 



Stone). 2. Shales and sandstones, with 



2. Greensands. septarian concretions. 



3. Blue clays. 3. Brown sandstones, gritstones, and 



4. Soft dirty-grey sandstones. pebbly beds. 



5. Quartzose conglomerate, shales, 4. Gritstones, loose sands, and grits 



and brown coal. • with shales and seams of brown 



coal. 

 5. Quartzose conglomerates, passing 

 down into breccias. Bed-rock = 

 mica-schist. 

 The total thickness of the Tertiary basal conglomerate is about 

 300 feet, and of Cretaceous basal conglomerates about 1,500 feet. 



The Cretaceous age of the Shag Point Series has always been 

 admitted, but according to the Cretaceo-Tertiary theory this series is 

 the horizontal equivalent of the adjoining Shag Valley — Waikouaiti 



Ttuke-WL tahi 



Shag 7?iver 



2. 



Fig. 2, showing relationship of Lower Tertiaries to Shag Point Cretaceous 

 Series. 1 and 2, Cretaceous beds ; 3, calcareous sandstone (Waikouaiti or 

 Ototara Stone), with Pseudamusium huttoni, Meoma crawfordi, etc., as 

 seen in north bank of Shag Biver, opposite Pake-iwi-tahi Cairn, where 

 subject to tidal influence . 



Series, which contains the typical Lower Tertiary fauna of the Oamaru 

 Series. Here we have the Cretaceous ( Waipara) Series and the Lower 

 Tertiary (Oamaru) Series lying side by side. The Cretaceous rests on 

 the mica-schist, and the Tertiary on both the schist and the various 

 members of the Cretaceous. 



Professor Cox when a supporter of the Cretaceous theory examined 

 Shag Point, and seeing the difficulty of correlating the two series with 

 one another, suggested the existence of a fault on the north side of 

 the Lower Shag Valley, along the boundary of the two series. 

 Of this fault there is no structural evidence whatever, but, even if 

 it does exist, it merely serves to emphasize the unconformity between 

 the two series, for if the fault is meant to imply that the Tertiary 

 Series followed the Cretaceous Series conformably, and has been 

 merely faulted down into its present position in the Shag Valley, 

 then obviously in the faulted portion we should expect to find the 

 Cretaceous Series underlying the Tertiary Series, but as a matter of 

 fact the Tertiaries rest hard on the mica-schist and wrap round the 

 edges of the Cretaceous. 



Mr. A. G. MacDonald, B.E., Government Research Scholar for 

 Otago, has just completed a detailed geological survey of the Shag 



