354 C. A. COTTON 



A false appearance of bedding in the Grey Marl, nearly at right 

 angles to the real stratification, is produced by the downward 

 continuation of the faults, veins having been formed along the fault 

 planes, which stand out a little from the bare, denuded surface of 

 the weak marl. 



In the Dee River (north branch) there is also a clear section 

 showing the conformable relation between the Grey Marl and 

 the conglomerate, in which the upper part of the Grey Marl is 

 sandy, and contains near the top small pebbles of "Maitai" (pre- 

 Cretaceous) graywacke, up to ^ in. in diameter. Next follow 

 lenticular masses of conglomerate composed of "Maitai" pebbles 

 the largest of which are the size of a hen's egg, and from this there 

 is a gradual passage to the typical conglomerate with sandstone 

 bands. 



COMPOSITION 



The writer can confirm, in a general way, the descriptions of the 

 conglomerate, at the various localities visited, as given by McKay, 

 some of which were quoted on an earlier page.^ McKay, however, 

 in almost every description, reports the occurrence of coarse- 

 grained igneous rocks resembhng the intrusives of the Kaikoura 

 Range, which have recently been described by Thomson.^ These 

 are referred to in the description of the Deadman's Hill conglom- 

 erate as follows: "Hornblendic and syenitic rocks brought from 

 the central part of the Inland Kaikoura Range are very abundant."^ 

 In the Clarence Valley, on the watershed between the Ure and 

 Swale, ''abundance of crystalline dyke-rocks derived from the 

 higher part of the Tapuaenuka Range" are reported in the con- 

 glomerate,'' and McKay concluded that the abundant bowlders of 

 igneous rock in the lower Ure River were derived from this source. 

 The writer was unfortunately unable to examine the conglomerate 

 closely at the source of the Ure, but a reconnaissance in the lower 



' See also, for descriptions of the conglomerate at Deadman's Hill, McKay, op. cit. 

 (1886), p. 116; {i8qo), p. 171; and for the Clarence Valley, McKay, op. cit. {1886), 

 pp. 118-22; {1890), pp. 174-78. 



^ J. Allan Thomson, "On the Igneous Intrusions of Mt. Tapuaenuka," Trans. 

 N.Z. Inst., XLV, 308-15, 1913. 



3 McKay, op. cit. (1886), p. 116. *Ibid. {1886), p. 119. 



