516 



Transactions. — Geology. 



markably clear, and of great importance, as it shows the 

 relations of the Oamaru Stone to the Oamaru or Waiareka 

 tuffs and to the Hutchinson Quarry beds. It is as follows : — 



SW. 



jF&e 



Section of Sea-cliff north of Bifle-butts. 



1. Tuffs. 2. Bed of coralline limestone, 6 ft. 3. Greenish-blue 

 sandstone, 9 ft. 4. Coralline limestone (Oamaru building-stone), 

 80 ft. 5. Yellowish-green fopsiliferous-tuff bed, 12 ft. 6. Hutchin- 

 son Quarry beds, consisting of hard rubbly limestone, 7 ft., overlain 

 by greensands, 11 ft. thick. 7. Impure shelly limestone, 3 ft. 

 thick, crowded with Turritclla caver shamcnsis. 8. Fine bluish- 

 green sandstones weathering brown, exposed on beach for a distance 

 of 50 yards. 9. Raised beach, 5 ft. or 6 ft. above high water of 

 spring tides, consisting of beach-shingle mixed with littoral shells all 

 belonging to living species. The most common forms are Mactra 

 discors, Chione oblonga, Dosinia austraiis, Atactodea subtriangulata, 

 Mytihts edulis, Trochus tiaratus, &c. 



The beds strike N.W.-S.E., and dip S.W. at angles vary- 

 ing from 32° to 35°. The dip of the beds as shown in fig. 8 is 

 somewhat exaggerated, in order to crowd the strata into the 

 width of the page. 



In this section the Awamoa and Hutchinson Quarry beds 

 are seen to be part and parcel of the same series, a contention 

 urged on several occasions by Mr. McKay, and now admitted 

 by Captain Hutton. 



Both Captain Hutton and Mr. McKay correctly enough 

 place the Hutchinson Quarry beds above the Oamaru building- 

 stone, but the former, failing to recognise the existence of two 

 limestones in North Otago, and believing the Oamaru Stone 

 to be the closing member of the Oamaru series instead of the 

 lower of the two limestones, ascribes the Hutchinson Quarry 

 beds to a period subsequent to the Oamaru series. 



From bed No. 8, which I believe to be the equivalent of 

 the Awamoa beds, I collected the following forms : — 



1. Scaphella corrugata, Hutton. 



2. Struthiolaria papulosa, Martyn. 



3. Turritclla caver shamensis, Harris. 



4. Turritella rosea, Quoy and Gaimard. 



5. Turritella kanieriensis, Harris. 



6. Teredo heaphyi, Zittel. 



