Uttlet. — Remarks on BuUefin No. 20. 169 



Art. XXIV. — Remarks on Bulletin No. 20 (New Series) of the New 



Zealand Geological Survey. 



By G. H. Uttley, M.A., M.Sc, F.G.S., Scots College, Wellington. 



[Read before the Wellington Philosophical Society, 6th December, 1919 ; received by Editor, 

 31st December, 1919 ; issued separately, 15th June, 1920.] 



■ Contents. 

 I. Introduction. 

 II. The "Two-limestone" Theory. 



III. Description of the Hutchinsonian and Awamoan Stages as 



interpreted by Park. 

 (1.) Awamoan Beds. 

 (2.) Hutchinsonian Beds. 



IV. Hutchinsonian and Awamoan Localities. 



(1.) All Day Bay. ' 



(2.) Deborah. 



(3.) Coast North of Kakanui Quarry. 

 (4.) Oamaru Rifle Butts. 

 (.5.) Hutchinson's Quarry. 

 (6.) Target GuUy. 

 (7.) Upper Target Gully. 

 (8.) Ardgowan Shell-bed. 

 (9.) Devil's Bridge. 

 (10.) Landon Creek and Flume Creek. 

 V. Bortonian and Waiarekan Locahties. 

 (1.) Bortonian. 

 (2.) Upper Waiarekan. 



(a.) Kakanui South. 



(6.) Boatman's Harbour. 



(c.) Shirley Creek. 



(d.) Awamoa Creek, near Deborah. 



(e.) Grant's Creek. 

 VI. Summary and Conclusion. 



I. Introduction. 



In Bulletin No. 20 (New Series) of the Geological Survey Branch of the 

 Mines Department Professor Park has described the geology of the Oamaru 

 district of North Otago. The present writer has examined this area in 

 some detail, and his observations have been recorded in several papers 

 read before this society. In several important matters he finds him- 

 self at variance with Professor Park, and some notes on the latter's 

 recent work are given in the following pages. The paper deals with the 

 " two-limestone " theory of Professor Park, with his classification of the 

 fossibferous tufaceous beds, and with his subdivision and correlation of 

 the beds of north-eastern Otago. The evidence on which the present 

 writer's conclusions are based has been detailed in former papers. 



Park first formulated his " two-limestone " theory in an attempt to 

 reconcile the differences of opinion that had long existed between Captain 

 Hutton and other geologists as to the position of the so-called " Pareora 

 fauna " The present writer (1916, p. 25) showed that the " two- 

 1 mestone " theory was not tenable in the Oamaru coastal district, and 

 that the Awamoan (Pareora) beds lie above the limestone and Hutchinson 

 Quarry beds. In Bulletin No. 20 Park has accepted this interpretation 

 in part, for he places the Awamoan (Pareora) beds at the top of the series ; 

 but the so-called Waitaki stone is now placed in the Upper Hutchinsonian, 



