274 CAPT. p. Sv. HUTT02^ ON THE GEOLOGICAL POSITION- 



\ 



ISTo fossils have been found in the Grey Marl here, but no donbt 

 it is the same rock as the marl at Amuri BluiF, about 13 miles 

 distant. 



Conclusions. — The following conclusions can, I think, be fairlj' 

 drawn from the evidence : — 



1. The sections at Waipara, Weka Pass, and Motunau Eiver all 



show that the Grey Marl passes up confoa-mably into the 

 Mount-Brown beds; and these are the only described 

 sections in the whole of !N'ew Zealand where the relations 

 between these two rocks can be studied. 



2. At the Motunau Eiver the evidence is clear that an uncon- 



formity exists somewhere between the Grey Marl and the 

 lower beds of the Waipara System. 



3. At Kaikoura Peninsula (and probably at Amuri Bluff and 



Eiver Conway) the evidence is clear that the break is some- 

 where between the Grey Marl and the Amuri limestone. 



4. At Waipara and Weka Pass the Grey Marl passes downwards 



conformably into the Weka-pass Stone. The same is pro- 

 bably the case in the Motunau Eiver ; and these are all the 

 described sections in IN'ew Zealand where the relations be- 

 tween these two rocks can be studied. 



5. At Waipara and Weka Pass (and probably at Stonyhurst) the 



Weka-pass Stone rests on a water worn surface of the Amuri 

 limestone. In the Weka-Pass district the Weka-pass Stone 

 overlaps the Amuri limestone, and Mr. M'Kay's section of 

 ■ the Motunau Eiver probably shows that it rests unconformably 

 on the lower beds of the Waipara System. 



Consequently th^ break in the succession must be between the 

 Weka-pass Stone and the Amuri limestone. 



Pal^ontological Evidence. 



As it is necessary to restrict ourselves to the described fossils that 

 have been found in the district included in the sections, and not to 

 take in any from supposed equivalents of the rocks elsewhere, the 

 palseontological evidence is limited. 



The Amuri limestone is almost unfossiliferous, at any rate it con- 

 tains no characteristic fossils, but it is always associated with un- 

 derlying rocks containing remains of marine Saurians and Mesozoic 

 MoUusca. Mr. M'Kay says that at Amuri Bluff it contains the 

 same fossils as the Grey Marl *, but the only evidence of any value 

 that he gives is the finding of Pecten Zittelli, Hutton, in the Amuri 

 limestone. I have already hinted that this shell may have come 

 from the Grey Marl, where it was found by Dr. Hector ; but if its 

 occurrence in the limestone should be confirmed, it would merely 

 lessen the value of P. Zittelli for correlating rocks ; as this species 

 passes up into the Pareora System (Miocene). 



* Trans. N. Z. Institute, ix. (1876), p. 583. 



