256 DE. C. T. TEECHMAM ON THE [vol. lxxix,. 



At the next point, Te Ahu Ahu (the old Wesleyan Mission 

 Station), the rock is a fine-grained slightly concretionary mud- 

 stone. The stratification is here somewhat disturbed ; but, except 

 for purely local variations, it appears to be much the same as at 

 the other points on the south side of the Harbour. 



At Motutara, on the north side of the Harbour, the rocks are 

 extremely concretionary, and here have a very different strike. 

 They exhibit the characteristics of a fine mudstone. 



Assuming that there is no faulting of importance between the 

 Pseudomonotis Bed and Totara Point (and actually there seems to 

 be none), then the strata between these localities must have a 

 thickness of about 11,000 feet, and another like thickness must 

 separate the beds at Totara Point from those at Te Ahu Ahu. 



Since there is an almost continuous section between these points, 

 and since the stratification and strike and dip are throughout 

 extremely regular, it is reasonable to assume that the thickness of 

 the rocks from the Pseudomonotis Bed to Te Ahu Ahu is some 

 20,000 feet. 



IV. Conclusions regarding the Age of the 

 New Zealand Jurassic Deposits. 



It has been remarked that the Jurassic deposits in New Zealand 

 follow the Trias with apparent conformity. It is very probable 

 that, if the passage-beds in those districts where they are well seen 

 (such as Kawhia and the Hokonui Hills) were well searched, some 

 interesting fossils, especially among the brachiopods, would be 

 found. It is also possible that representatives of the Rhaetic beds 

 containing Avicula contorta, corresponding with the Napeng 

 Series of Burma, might be traced. I have illustrated a bivalve 

 which recalls that form ; but it is unfortunately too poor for ac- 

 curate determination. 



The lowest Jurassic rocks in which Prof. Marshall and I 

 collected are those at the junction of Taylor's Creek with the 

 Otapiri Stream in the Hokonui Hills. These beds contain two or 

 more species of the genus Psiloceras, of Hettangian age. The 

 occurrence of higher marine fossiliferous Liassic deposits is indi- 

 cated by certain ammonites in the British Museum, described 

 in the Appendix, § VIII. 



The fossiliferous deposits at Totara Point, Kawhia, yield some 

 brachiopods that recall those of the Putchum Beds of India, which 

 are referred to the Bathonian, These are Terebratula acutiplicata 

 Kitchin, and Pliynchonella pulclierrima Kitchin. A Ehyncho- 

 nellid bearing long spines in the Totara-Point Beds is thought to 

 be a spinous development of the latter form. Pecten (Campto- 

 nectes) lens is a well-known Bajocian and Bathonian fossil. 



On the other hand, several of the Totara-Point fossils closely 

 resemble those from Wai Calo in the Sula Islands, which Bcehm 

 refers to the Oxfordian, after a lengthy discussion of the relations 

 of the fossils to those of the Charee Group of Kutch. These 



