7 8 Tra?i sac tions . 



absent, but it is represented stratigraphically by a strongly glauconitic lime- 

 stone, whose glauconitic character is strongly marked in the flaky quad- 

 rangular blocks into which the stone is divided, but more strongly still in 

 the interstitial portions. A well-defined layer of nodules occurs in this lime- 

 stone, the matrix being a markedly glauconitic limestone. The nodules are 

 of two types— (1) ordinary phosphatized limestone, and (2) small dark -green 

 nodules up to 1 in. in diameter, scattered through the nodular layer and 

 through the next 4 ft. of the bed above. The nodular layer is not so well 

 defined as usual, but passes gradually into the beds above and below it. 

 Worm-borings are a feature of the occurrence, and there is an entire absence 

 of any evidence of unconformity. The whole arrangement gives a good 

 illustration of the modification in the character of the Amuri limestone as it 

 approaches a shore-line, and supports the contention of some writers that 

 greensand can be laid down in comparatively shallow water. 



The other type of contact showing the relations of the Amuri limestone 

 to the Weka Pass stone can be clearly seen on the northern slope of the 

 escarpment to the south at an elevation of between 1,600 ft. and 1,700 ft. 

 The following is a description of the contact as seen over a considerable 

 length of the escarpment : The Amuri limestone is from 150 ft. to 200 ft. 

 in thickness, well stratified and jointed, divided by narrow layers of more 

 or less marly material, in the lower part and by seams of glauconitic material 

 in the higher part, with occasional worm-borings on the top of the hard 

 limestone layers. These borings are filled with marly material in the lower 

 parts and by glauconitic material in the higher parts, corresponding to the 

 character of the layer which was being deposited while the borings were 

 being made. Glauconitic material becomes more pronounced in the higher 

 parts till it passes into the Weka Pass stone, which is here slightly more 

 glauconitic than in the typical locality. The sequence is perfectly con- 

 formable throughout, the limestones changing from the Amuri to the Weka 

 Pass facies with characteristic passage beds in which the two types are 

 interstratified along the line of junction. In some places it is difficult to 

 tell the precise line of demarcation of the two. No nodules were seen. 



North Side of Waikari Creek between Waikari and Scargill. 



On the north side of this stream lies a prominent band of limestone 

 with a west-south-west strike, dipping south -south-east. It is a remnant 

 of a more extensive covering sheet of Tertiary sedimentaries which has been 

 faulted into a position less exposed to destructive agents as a result of earth- 

 movements which have affected the whole region. The main fault-line 

 follows approximately the line of the stream-valley, but a number of sub- 

 sidiary faults running parallel to this on its northern side are plainly in 

 evidence in the upper basin of the Scargill Creek, where there are a number 

 of parallel belts of limestone, generally dipping south-east, the repetition of 

 the outcrops being directly attributable to this series of faults. The steep 

 scarps face north-west, and they give good opportunities for examining the 

 limestone through its whole thickness. Specially good exposures occur on 

 the north side of the high escarpment behind the greywacke barrier which 

 divides the Scargill basin from the Waikari Valley, and fronting the stripped 

 surface of greywacke which separates the former from the Culverden basin. 

 The section shows that the limestone band is composed of alternating 

 layers of more or less glauconitic material, some of which, usually the less 

 glauconitic, have the jointing characteristic of the Amuri limestone, while 



