124 Transactions. 



The greensand yielded Epitonium lyratum (Zitt.). Terebratulina suessi 

 (Hutt.). Pctchymagas parki (Hutt.). Aetheia gualteri (Morris), and Hemi- 

 thyris sp. 



In this locality also we have the nodular band occurring at the base 

 of the greensand, and notable for the abundance of alcyonarian stems. 

 Dr. Thomson informs me that a nodule collected by him. from this 

 locality was analysed by Mr. B. C. Aston and showed 1*8 per cent. P 2 5 . 

 equivalent to 2-9 per cent. Ca 3 P 2 8 . 



V. Summary. 



(a.) There has been at least one period of vulcanicity subsequent to the 

 Waiarekan tuffs. It is more than probable that there were two periods 

 of eruption, the mineral breccia of Kakanui being the record of the first, 

 while the volcanic rocks at Grant's Creek indicate the last phase. This is 

 not so evident in the present area, as nowhere are the two types of volcanic 

 rocks represented in the same section, although the breccia at Water-race 

 Creek is certainly farther down in the limestone than the volcanic rocks 

 at Ardgowan. In the town of Oamaru, however, the intrusive rocks cut 

 across interbedded limestone and breccia beds. 



(b.) The mineral breccia of Kakanui (see Thomson, 1906) extends into 

 the Papakaio district, and forms a well-marked stratigraphical horizon 

 throughout the whole Oamaru coastal district. 



(c.) The diatomaecous-earth deposits occur at Papakaio associated with 

 tachylite tuffs, as in the earlier known deposits in Cave Valley. This repre- 

 sents a considerable extension of its range. 



(d.) The nodular band is persistent throughout the Oamaru and Papa- 

 kaio districts from Kakanui to Papakaio, a distance of about twenty miles, 

 and is phosphatic at both these localities. As a hardened band of lime- 

 stone often underlies it, and has been proved phosphatic by Morgan (1915) 

 at Hutchinson Quarry, it may reward investigation elsewhere. 



(e.) In the Papakaio district there is no evidence of two distinct lime- 

 stones separated by the Hutchinson Quarry and Awamoa beds, as contended 

 by Park (1905). 



(/.) Dr. Thomson informs me that the fauna beneath the Maerewhenua 

 limestone, farther up the Waitaki Valley, bears a strong resemblance to 

 that of the upper part of the Ototara stone in the Landon Creek area. 

 Detailed stratigraphical work between Papakaio and the Maerewhenua 

 districts should therefore go far towards settling the vexed question of the 

 relationship between the Oamaru and Waitaki stones. There are many 

 excellent natural sections in the Maerewhenua district that have not yet 

 been described. 



Bibliography. 



Hector, J., 1882. Index to Fossiliferous Localities in New Zealand, Rep. Geol. Explor. 



dur. 1881, pp. 118-2S. 

 McKay, A., 1877. Oamaru and Waitaki Districts, Rep. Geol. Exphir. dur. 1876-77, 



pp. 41 66. 

 Marshall, P., and Uttley, G. H.. 1913. Some Localities for Fossils at Oamaru, Trans. 



N.Z. Inst., vol. 45, pp. 297-307. 

 Morgan, P. G., 1915. Phosphate Occurrences in the South Island, 9th Ann. Rep. 



(n.s.) N.Z. Oral. Surv. : pp. 97-98. 

 Park, J., 1905. On the Marine Tertiaries of Otago and Canterbury, "with Special 



Reference to the Relations existing between the Pareora and Oamaru Series, 



Trans. N.Z. Inst., vol. 37, pp. 489-551. 

 Thomson, J. A., 1906. The Gem Gravels of Kakanui, Trans. N.Z. Inst., vol. 38, 



pp. 582-95. 

 Uttley, G. H., 1916. The Geologv of the Neighbourhood of Kakanui, Trans. N.Z. 



Inst., vol. 48, pp. 19-27. 



