58 Transactions. 



stage of the Oamaruian, together with the upper part of the limestone of 

 the northern area. The marginal terrigenous deposits of this period are 

 unknown unless they are represented in ih.Q Malvern Hills beds, though 

 the presence of Conchothyra parasitica in these renders this unlikely. The 

 area occupied by the Amuri sea now appears to have been elevated, or at 

 least to have remained stationary, allowing it to shoal with sediments, 

 while at the same time its margins became very widely extended north 

 and south, forming the eastern Oamaruian sea, which was probably only 

 a part of the Pacific Ocean. It will be noticed that the above account 

 postulates that the Amuri sea was not entirely closed, for an extension of its 

 margins with depression is dependent on a connection with the open ocean. 

 Much of the above is speculative, but will serve a useful purpose if it 

 calls attention to the peculiar nature of the Amuri limestone, the flint- 

 beds, and the sulphur sands, and provokes an alternative explanation. 

 During most of the field-work on which this j)aper is based I was accom- 

 panied by Dr. C. A. Cotton, to whose kindly criticism I desire to express 

 my indebtedness. 



List of Papers referred to. 



Andrussow, N. 1897. " La Mer Noire," Guides des Excursions, VIP 



Cong. Geol. Internat., St. Petersbourg, 1897, art. xxix. 

 Cotton, C. A. 1913. " The Physiography of the Middle Clarence Valley, 



New Zealand." Geogr. Journal, vol. 42, pp. 225-45. 

 Daly, R. A. 1907. " The Limeless Ocean of Pre-Cambrian Times." Am. 



Jour. Sci., vol. 23, pp. 93-115. 

 Hector, Sir J. 1877. " Marlborough and Amuri Districts." Rep. Geol. 



Explor. during 1873-74, pp. ix-xiii. 



1890. " Marlborough District." Rep. Geol. Explor. during 1888-89, 



No. 20, pp. xxxvi-xxxviii. 



Hutton, F. W. 1877. " Report on the Geology of the North-east Portion 

 of ihQ South Island, from Cook Strait to the Rakaia."" Rep. Geol. 

 Explor. during 1873-74, pp. 27-58. 



Liversidge, A. 1877. " Notes on some of the New Zealand Minerals 

 belonging to the Otago Museum." Trans. N.Z. Inst., vol. 10. pp. 490-505. 



Marshall, R; Speight, R. ; and Cotton, C. A. 1911. "The Younger 

 Rock-series of New Zealand." Trans. N.Z. Inst., vol. 43, pp. 378-407. 



McKay, A. 1877. '"Report on Kaikoura Peninsula and Amuri Bluff." 

 Rep. Geol. Ex-plor. during 1874-76, pp. 172-184. 



— ~ 1886. " On the Geology of the Eastern Part of Marlborough Pro- 

 vincial District." Rep. Geol. Explor. during 1885, No. 17, pp. 27-136. 



1887. " Report on Cape Campbell District." Ihid., pp. 185-91. 



1890. " On the Geology of Marlborough and the Amuri District of 



Nelson." Rep. Geol. Explor. during 1888-89, No. 20, pp. 85-185. 



1891. "On the Geology of Marlborough and South-east Nelson: 



Part II." Rep. Geol. Explor. during 1890-91, No. 21, pp. 1- 

 Schuchert, C. 1915. " The Conditions of Black Shale Deposition as 



illustrated by the Kupferschiefer and Lias of Germam^." Proc. Am. 



Phil. Soc, vol. 44, pp. 260-69. 

 Thomson, J. A. 1915. " Oil-indications in the Benmore District, East 



Marlborough." 9th Ann. Rep. (n.s.) N.Z. Geol. Surv., Pari. Paper 



C.-2, pp. 100-1. 

 Trechmann, C. T. 1914. " On the Lithology and Composition of Durham 



Magnesian Limestone." Quart. Jour. Geol. Soc, vol. 70, pp. 232-65. 



