Uttley. — Remarhs on Bulletin No. 20. 181 



(d.) Awamoa Creek, near Dehorah (p. 41). — The base of the section 

 (fig. 5) is a basalt showing pillow-structure similar to the lower pillow- 

 lava at Boatman's Harbour. The two rocks have been described by the 

 writer (1918a, p. 113), and there is little doubt that they are at the same 

 horizon. The rock at Boatman's Harbour has been shown to be almost 

 certainly Ototaran, and the pillow-lava in the present locality must be 

 referred to the same stage. The highest bed of the section is a brecciated 

 pillow-lava exactly similar to the highest bed in the section at Boatman's 

 Harbour, while the intermediate beds are calcareous fossiliferous tuffs 

 and limestones. The fossils recorded from the tufaceous beds above the 

 lower pillow-lava in the present locality are in rather poor condition, and 

 the percentage of Eecent species as determined by Suter is 37-5. The 

 evidence is scarcely sufficient to warrant these rocks being classed as 

 Waiarekan. 



(e.) Grant's- Creek (p. 45). — In fig. 14 a section is given on the east 

 bank of Grant's Creek, near Oamaru. It shows the Oamaru stone with 

 interbedded bands of basaltic conglomerate, and the soft friable greenish 

 glauconitic calcareous tuffs underlying are called Waiarekan. These beds 

 are horizontal, and it is stated that " less than 50 yards higher up the 

 stream, and on the same side, the Oamaru stone is followed by the Hutchin- 

 sonian greensands crowded with Pachijmagas parki (Hutt.)." The n^aximum 

 thickness of the rocks above the tuft's is 21 ft., and, as the rocks are hori- 

 zontal, and the Hutchinsonian beds occur a short distance away capping 

 the limestone, these tufaceous beds are certainly not Waiarekan. The 

 development in the present section is very similar to the section exposed 

 lower down the stream and described by the writer (1918b, p. 121, fig. 3). 

 In that section 20 ft. of limestone separates the volcanic rocks of Oamaru 

 , Creek froni the Hutchinsonian greensands, and Park rightly considers 

 these volcanic rocks as Upper Ototaran (see geological map, Bulletin 20). 

 The tufaceous beds in the present locality are therefore Ototaran. These 

 beds mapped by him in the basin of Grant's Creek as Waiarekan are similar 

 to those developed at Upper Target Gully which he has mapped as 

 Upper Ototaran. A comparison of the sections shown on page 82 at Upper 

 Target Gully (figs. 37 and 38) will indicate the similarity of the rocks in 

 the basin of Grant's Stream to those at Upper Target Gully. Similar 

 sections occur at Hutchinson's Quarry (1918a, p. Ill), Lower Target Gully 

 (Bulletin 20, p. 80), and Eden Street, Oamaru (Bulletin 20, p. 60). The 

 present writer, in his description of the Hutchinson Quarry and neigh- 

 bourhood (1918a, p. 112), showed that the fossiliferous beds at Boatman's 

 Harbour which He beneath the brecciated pillow-lava are certainly not 

 Hutchinsonian, as contended by former geologists, and Park in his latest 

 work has reached the same conclusion, as his geological map clearly shows. 

 The writer's argument was based solely on the correlation of the upper 

 volcanic rocks at Boatman's Harbour and Oamaru Creek near the junction 

 of Grant's Stream, and as Park also correlates these volcanic horizons there 

 can be no doubt that the volcanic horizon in the present section is not 

 Waiarekan but Ototaran (Upper Ototaran). 



In the localities that have been discussed, if these so-called Waiarekan 

 tuffs are Ototaran tuffs, then Park's fauna of the Upper Waiarekan is 

 reduced from sixty-four species to the seventeen species detailed on pages 43 

 and 44 of Bulletin No. 20. The brachiopods quoted there are character- 

 istic Ototaran fossils, four of the Mollusca are new species, Clio anmdata 

 (Tate) is not found elsewhere in New Zealand, Amusium zitteli (Hutt.) is 

 not recorded from any other locality in North Otago, and the remaining 



