Uttley. — Tertiary Geology, Otiahe River to Duntroon. 153 



Lower Hutchinsonian (1918, p. 109). He would, however, j)lace the lime- 

 stone in the present locality in the Upper Hutchinsonian ; but the evidence 

 is strongly against it, as the brachiopods mentioned above occur below 

 the " parhi " band in the Oamaru district. The Otiake beds, which lie 

 above the limestone, contain an Awamoan molluscan fauna, and in the 

 absence of the typical brachiopod of the Hutchinsonian, Pachymagas farki 

 (Hutt.), it is a difficult matter to differentiate the Hutchinsonian horizon 

 in the Waitaki Valley. McKay and Hutton both considered the Awamoa 

 ^eds to be part and parcel of the same series, and this may be true when 

 the molluscan fauna alone is taken into account, although the Awamoan 

 beds are far more fossiliferous than the Hutchinsonian. The Otiake beds 

 at their base are lithologically similar to the Hutchinson Quarry beds, 

 and all the evidence available tends to show that the Otiake beds are the 

 equivalent of the Hutchinsonian-Awamoan horizon of the typical Oamaru 

 district. The Otekaike limestone has been shown to be underlain by the 

 basal rocks of the Tertiary series, and not by the " subschistose " rocks 



■ of McKay, and this fact invalidates the only evidence produced by McKay 

 to prove an unconformity between the lower part of the Maruwenua 

 limestone and the middle portion of that rock (his Otekaike limestone). 

 It has been shown that McKay considered the Hutchinsonian (" Phorus 

 beds ") to lie above the limestone, and not below it as Park believes. The 



• Waitaki Valley in the present locality is a tectonic depression, being partly 

 a graben and partly a fault-angle depression. Extensive faulting has been 

 proved by geological evidence. 



Bibliography. ' 



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