Thomson. — Geology of Middle Waipara and Welri Pass District. 323 



they are rarely strongly folded, except in the neighbourhood of strong 

 faults, and in general exhibit only a tilting or warping which they share 

 equally with the undermass as a consequence of block-faulting. Owing to 

 their softer nature they rarely occur far up the slopes of the tilted blocks, 

 but are confined to the lower levels near the fault-angles. 



The ages of the lower and upper members of these younger rocks vary 

 greatly in different districts in New Zealand, and there is no locality where 

 a complete series is found in superposition. Consequently it has seemed 

 desirable to give them in their totality a descriptive name — viz., the 

 Notocene — and to define it by diastrophic considerations as embracing all 

 the beds deposited between the post-Hokonui and Kaikoura deformations 

 (Thomson, 1917, p. 408). 



The Notocene may be divided into the following divisions : — 



Oamaruian 



Awamoan 



Hutchinsonian 

 ■ Ototaran 



Waiarekan 

 \Ngaparan 



Paparoan 



Kaitangatan 



Upper Miocene. 

 Lower Miocene. 

 Oligocene. 



Danian to Eocene. 



Piripauan 



Senonian. 



Turonian-Cenomania n. 



Clarentian 



Albian. 



In 1919 I gave a description of the Notocene sequence in the Clarence 

 Valley, Marlborough, which ranges from Clarentian to Awamoan, and pos- 

 sibly to Waitotaran. The North Canterbury Notocene sequence described 

 in the present paper includes marine rocks ranging from the Piripauan to 

 the Waitotaran, with an overlying terrestrial series of possibly Castleclifl&an 

 age. These rocks form a tilted strip running from the neighbourhood of 

 Mount Grey north-east across the Waipara River in its middle reaches, 

 and across its tributary the Weka Creek, occupying the whole of the 

 Weka Pass, and thence continuing nearly east for eight miles or more a 

 little to the south of the Waikare River. This strip is bounded on the 

 north-western side by the pre-Notocene rocks of Mount Grey, the Doctor's 

 Range, and the hills south of the Waikare River, except for a short distance 

 near the township of Waikare, where its lower members abut against the 

 recent alluvium of the Waikare River. On the south-east the upper mem- 

 bers dip under the continuous gravel-plain of the Kowhai and Waipara 

 Rivers and their tributaries. The area covered by these Notocene rocks 

 may conveniently be known as the Middle Waipara and Weka Pass district, 

 in distinction to the Upper Waipara district, near Heathstock, and the 



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