Speight and Wild. — Weka Pass Stone and Amuri Limestone. 65 



Art. V. — The Stratigraphical Relationship of the Weka Pass Stone and 



the Amuri Limestone* 



By R. Speight, M.Sc, F.G.S., Curator, Canterbury Museum, and Lecturer 

 on Geology, Canterbury College ; and L. J. Wild, M.A., B.Sc, F.G.S., 

 Lecturer on Chemistry, Canterbury Agricultural College, Lincoln. 



[Read before the Philosophical Institute of Canterbury, 5th September, 1917 ; received by 

 Editors, 31st December. 1917 ; issued separately, 24th May, 1918.] 



Plates IV-VII. 



Contents. 

 Introduction. 

 Detailed Description of the Limestones. 



Amuri Limestone. 



The Nodular Layer. 

 , Phosphatic Nodules. 



Microscopic Description of a Typical Nodule. 

 Nodular Limestone. 



Weka Pass Stone. 

 Historical Summary. 

 Detailed Descriptions of Important Sections. 



Weka Pass. 



Main Branch of Weka Creek. 



Upper Waipara. 



North-east Slope of Mount Grey. 



South Branch of Omihi Creek. 



North Side of Waikari Creek between Waikari and Scargill. 



Gore Bay. 



South Bank of the Hurunui. 



On Coast South of the Blyth Ri ver. 



Stonyhurst, in a Creek near the Homestead. 



Motunau River. 



Boundary Creek- 

 South Side of Amuri Bluff. 



On Bluff North of the Mikonui Creek. 



Near Maori Village on South Side of Kaikoura Peninsula. 



North of Atiu Point, East End of Kaikoura Peninsula. 



North Side of Kaikoura Peninsula. 



Mouth of Lyell Creek, Kaikoura. 



Puhipuhi Valley and Long Creek. 

 Contact of the Grey Marl with the Underlying Limestone. 



Main Branch of Weka Creek. 



Near Old Wharf, North Side of Kaikoura Peninsula. 



East Side of Kaikoura Peninsula. 



South Side of Amuri Bluff. 

 Evidence that the Series is Conformable. 

 The Peculiarities of the Junction of the Amuri Limestone and Weka 



Pass Stone. 



Introduction. 



The area referred to in this paper stretches from the neighbourhood of the 

 Waipara River in a north-easterly direction across the Hurunui River, up 

 the coast past Amuri Bluff, to just north of Kaikoura, a total distance of 



* We desire to state that .we have been enabled to make the observations recorded 

 in this paper largely through the award of a grant by the New Zealand Institute for 

 research work on the phosphate-bearing rocks of Canterbury. 



3— Trans. 



