74 Transactions. 



Thomson also (1912, p. 8) has noted the physical conformity of the beds in 

 the typical locality, whereas Morgan (1915, pp. 90-93), the latest writer on 

 the subject, as a result of a hurried visit came to the conclusion that the top 

 of the Amuri limestone presented a true erosion surface, but as the result 

 of more complete examination of the relationship of the beds expresses 

 himself in a less dogmatic manner (1916, pp. 17-28, and 1916a, pp. 10—11), 

 and has evidently some doubts as to the correctness of his first interpretation, 

 although he still agrees tentatively with Hutton and Park in his latest 

 pronouncement. 



Detailed Descriptions of Important Sections. 



In order to arrive at a thorough appreciation of the problem a detailed 

 description will be given of all localities where contacts occur from the 

 neighbourhood of Mount Grey to just north of Kaikoura, and from the 

 sea-coast as far inland as limestones occur which furnish any evidence. 

 This ranges over a belt of country nearly one hundred miles in length and 

 with a maximum breadth of fifteen miles. The localities first taken are 

 those in the neighbourhood of Weka Pass, the typical locality ; then those 

 near the Waipara River and Mount Grey. They are followed north-east to 

 Cheviot, when a return is made along the coast by way of the Hurunui 

 mouth, Stonyhurst, and Motunau ; and the series concludes with those at 

 Amuri Bluff, Kaikoura, and the Puhipuhi River. We do not think that 

 any important locality in that area has been omitted from consideration. 

 It will be noticed that there is a general similarity of the sections throughout 

 the area, both in its length and its breadth, which the advocates of uncon- 

 formity will find difficult to explain, while the evidence for conformity is 

 particularly strong. 



Weka Pass. 



Good contacts can be seen at various places in the neighbourhood of the 

 pass — e.g., on the roadside just past Seal Rock, in the little gorge near the 

 viaduct, on the northern face of the escarpment just east of the viaduct, 

 and on both sides of the denuded anticline to the west of the viaduct. 

 (Plates IV and V.) The following description fits in each case : — 



(1.) Amuri limestone: White, and jointed into flaky quadrangular blocks, 

 the upper 2 ft. or more being bored by marine worms and the casts filled 

 with glauconitic limestone. The amount of boring increases progressively 

 upward till what may be called the transitional layer is reached. 



(2.) Transitional layer : This consists in its lower part of Amuri lime- 

 stone material thoroughly bored, with the interstices filled with glauconitic 

 limestone. The result of boring increases progressively, and the quantity 

 of glauconitic material also increases pari passu. The upper 6 in. is com- 

 pletely bored, so that peninsulas of Amuri limestone project at times into 

 i he overlying glauconitic layer, and at times become detached and resemble 

 subangular pebbles in appearance. They are more phosphatic than the 

 underlying limestones, and the included glauconitic limestone is more 

 phosphatic than the overlying glauconitic layer. The number of residual 

 fragments of limestone decreases till they are entirely absent from the 

 distinct layer of strongly glauconitic limestone. Included in this band 

 are small angular nodules, green or black in colour, which are strongly 

 phosphatic. Very occasionally, small well-rounded pebbles of quartz, about 

 I in. in diameter, are met with. 



