438 Transactions. — Geology. 



9. Halohia claystones. 

 10. Spiriferina claystones. 



In Sellen's section the sequence is : — 



0. Fossiliferous limestone (Maitai limestone). 



1. Claystones. 



2. Upper granitic conglomerate and grit-stone. 



3. Claystones (no Mytilus seen). 



4. Sandstone and claystone, with Mytilus at base. 



5. Lower granite conglomerate. 



6. Claystones, with Halobia. 



7. Sandstones and claystones, with Halobia, Rhyn- 



chonella, Syiriferina, and corals. 



8. Plant beds. 



One of the clearest sections of the Trias rocks is exposed 

 in Well's Creek, where the sequence is as follows : — 



0. Fossiliferous calcareous gritty sandstone. 



1. Claystones. 



2. Upper granite conglomerate. 



3. Mytilus sandstones and claystones. 



4. Spirigera sandstones. 



5. Mytilus sandstones. 



6. Spirigera sandstones. 



7. Lower granite conglomerate. 



8. Halobia claystones. 



9. Spiriferina claystones and sandstones. 

 10. Plant beds. 



In the Wairoa and Sellen's sections the Trias formation 

 is closed with a limestone (the Maitai limestone of Hector), 

 from which I collected Spiriferina (two sp.), AiJiyris, Bliyn- 

 chonella, Pleurotoviaria, Inoccramus, Pcntacrinns, and corals 

 (three sp.). 



In many places the limestone is argillaceous, gritty, and 

 pebbly. It has been broken and shattered into small angular 

 fragments, which have been recemented by white veins of cal- 

 cite. Fossils are not at all common, and where found are dif- 

 ficult to exti-act in a complete state on account of the jointed 

 and veined condition of the material. Of the different forms 

 present Inoceravms was found to be the most abundant. 



Among the collections made by Mr. McKay Sir James 

 Hector is said to have identified the Carboniferous forms 

 Spirifera bisulcata, Productus branchy tJuerus, and the genera 

 Cathophyllum and Cathocrinu^ among the corals.* Consider- 

 ing the imperfect character of most of the specimens and 

 their association with Inoceravms, a good deal of doubt must 

 necessarily attach to these determinations. 



The large brachiopod identified as Spirifera bisulcata seems 



• Reps. Geol. ExpL, 1878-7'J, p. 1 17. 



