Hutton. — On Sections in Weka Pass. 259 



3. Dark-grey sandy marl, iuterstratified with grey sandy 



limestone. 



2. Grey sandy limestone passing gradually into 



1. Weka Pass stone. 



We here reach the 45th milestone from Ghristchurch, about 

 three-quarters of a mile south of the railway viaduct. Beyond 

 this the Weka Pass stone forms the cuttings up to the viaduct ; 

 but at the bottom of the one furthest north the Amuri limestone 

 shows for a short distance. This appearance of the Amuri lime- 

 stone above its ordinary level is by a fault, represented in my 

 section of the Weka Pass made in February, 1873,* the fault 

 coinciding in position with the railway viaduct. 



The beds 3 to 5 constitute the " grey marl " of Dr. Hector, 

 and I estimate their combined thickness to be about 500 feet. 

 Unquestionably they are conformable to the Weka Pass stone. 



1. That the Weka Pass stone rests unconformably on the 

 Amuri limestone I have elsewhere tried to prove! , and this 

 has, I consider, been completely confirmed by my survey of the 

 Trelissick Basin last year,} where a distinct unconformity is 

 acknowledged to exist above the lower limestone ; which lime- 

 stone, I have shown, agrees in stratigraphical position as well as 

 in lithological composition with the Amuri limestone. 



The rocks immediately below the Amuri limestone in the 

 Weka Pass are not seen along the railway line ; but the most 

 northerly cuttings in the pass show — 



4. Dark greensands. 



3. Dark-grey, micaceous, sandy clay. 



2. Calcareous green sandstone with sharks' teeth. 

 1. Bright green argillaceous sands. 



Correlation of the Beds. 

 We have, therefore, in the Weka Pass five different series : — 



1 . The lowest contains the Amuri limestone and the under- 

 lying green sandstones, the correlations of which with the 

 saurian beds in the Upper Waipara are not doubted. 



2. Next above is the series comprising the Weka Pass stone, 

 and the overlying grey maris and sandstones. I have elsewhere 

 given a list of fossils from this series, § and have shown that they 

 agree with those from the Curiosity Shop, the Ototara building 

 stone, and the limestones of Maerewhenua and Waihao. Since 

 that paper was written I have been informed by Mr. J. D. Enys 



* ; 'Beports, Geological Exploration, 1873-74," p. 45, sect. 10. 



t " Quar. Jour. Geol. Soc. of London," vol. xli., p. 266. 



I " Trans. N.Z. Inst.," vol. xix.,p. 392. 



§ " Quart. Jour. Geol. Soc. of London," vol xli., p. 554. 



