492 



Professor James Park- 



strata. Captain Hutton, who still correlated the "Weka Pass Stone 

 with the Ototara intone, soon abandoned the Cretaceo Tertiary 

 succession and introduced an unconformity between the Weka Pass 

 Stone and the underlying Aniuri Limestone, the hiatus representing 

 as he believed the series of Tertiary stiata wliich underlies the Ototara 

 Stone in South Canterbury and North Otago. 



If the Weka Pass Stone is the horizontal equivalent of the Ototara 

 Stone, it is obvious that Captain Button's contention was unassailable. 

 Tlie position will be easily understood by a reference to Pig. 1. 



The Tertiary beds b, c, d, varying from 400 to 1,0U0 feet thick, 

 are absent in the North Canterbury sections. 



After my first examination of the Waifiara sections in the eighties^ 

 I became an ardent su})porter of the Ci etaceo-Tertiary succession ; but 

 a wider knowledge of our younger rocks gnined in later years 

 convinced me that the position was untenable, and like Captain Hutton^ 

 its originator, I was reluctantly compelled to abandon it. 



/!/. Otago 



/v. Canterlftort/ 



Fig. 1. Tertiary : (a) Ototara Stone ; {h) glauconitic sands ; (c) marly clays 

 and sands ; {d) quartzose sands with fireclays and brown coal. 



Cretaceous : (1) Amuri Limestone ; (2) glauconitic sands ; (3) shaly 

 clays with septarian concretions containing Saurian remains ; (4) quartzose 

 sands with shales and brown coal. 



After a lapse of nearly a quarter of a century Dr. Marshall and his 

 colleagues view the Waipara sections, and, influenced by the apparent 

 conformity of the Tertiary and Cretaceous strata, become enthusiastic 

 advocates of the Cretaceo-Tertiary succession. The contentions I used 

 in favour of the succession are now quoted against me. Of this 

 1 do not complain. I did the same with Captain Hutton. To the 

 voung geologist there is always something attractive and alluring 

 about a Cretaceo-Eocene succession, and I have no doubt that its 

 recrudescence will be periodic with every new generation of geologists. 



Dr. Marshall recognizes that the Ototara Stone is conformably 

 underlain by a great succession of marine beds containing a Tertiary 

 fauna, and the Weka Pass Stone by a Cretaceous fauna. This leads 

 him to revive the theory of overlap, which was frequently discussed 



