122 Transactions. 



3. Water-race Creek, Oamaru District. (Fig. i.) 



This creek is a tributary of Landon Creek. The rocks cover an area 

 of about half a square mile, and the exposure is isolated, but it is quite pos- 

 sible to determine the horizon of the upper beds. The section is noteworthy, 

 as it shows a bed of limestone of considerable thickness between two beds 

 of fragmental volcanic rocks. The beds dip E. 30° S.. at an angle varying 

 from 10° to 16°. 



The tuffs (a) are greenish-brown, much weathered, and cemented by 

 crystalline calcite. They are finer than the breccia higher in the section, 

 and do not contain the same variety of minerals. The limestone (b) is 

 tufaceous in parts, sometimes containing distinct bands of calcareous tuff. 



Bed (c) is a thick breccia similar in character to the '* mineral breccia " 

 of the Kakanui locality (cf. Uttley, 1916, p. 20). This is overlain by a 

 limestone which becomes glauconitic and fossiliferous towards the top. 

 The fossils obtained were : Epitonium lyratum (Zitt.), Pecten delicatidus 

 Hutt., P. poh/morphoides Zitt., Liothyrella boehmi Thomson, L. landonensis 

 Thomson, Murravia catinuliformis (Tate), Terebratulina suessi (Hutt.). 

 Pachymagas ellipticus Thomson, Rhizothyris rhizoida (Hutt.), Hemithyris sp., 

 Aetheia gaulteri (Morris). 



cu ~b C 



Fig. 4. — Section, Water-race Creek, Oamaru District. (a) Turfs: (b) limestone; 

 (r) calcareous mineral breccia ; (rt) limestone, glauconitic and fossiliferous 

 in its upper portion; (?) limestone band: (/) greensand: (g) hard 

 bracbiopod band : (h) river gravels. 



This bed is followed by a very hard white limestone (e) about 18 in. 

 thick. 



The greensand (/) overlying is crowded with brachiopods. The fol- 

 lowing fossils were collected here: Pecten hutchinsoni (Hutt.), P. huttoni 

 (Park), Epitonium lyratum (Zitt.). Pachymagas parki (Hutt.), Rhizothyris 

 rhizoida (Hutt). 



The bed (h), which is really the upper portion of (g), is a hardened 

 glauconitic stone. It contained Pachymagas parki (Hutt.) and Pecten 

 huttoni (Park). 



This greensand (g) and (A) evidently represents the Hutchinson Quarry 

 greensand, while the hard limestone band (e) represents the nodular band 

 at Kakanui and All Day Bay (cf. Uttley, 1916. pp. 20, 21, 23). 



1. Landon Creek, Papakaio Survey District. (Fig. 5.) 

 About a mile west of Trig. Station B, limestone and greensand occur 

 on both banks of Landon Creek. The section across the creek is shown 

 in fig. 5. The beds dip S. 30° E. at 8°. and this would take them beneath 

 the Awamoa beds at Pukeuri cutting. 



The lowest bed is a calcareous tuff, which, however, is not exposed in 

 section. The material excavated from the tunnel for the ( )amaru-Papakaio 

 water-race is a tuff, and from the position of the tunnel it must lie beneath 

 the limestone. This limestone is at least 50 ft. thick. It is pure and white 

 in it lower portion, but in its upper 20 ft. it becomes glauconitic, and near 

 the junction with the overlying greensand (c) there is an alternation of 



