22 Transactions. 



of volcanic rock is exposed, of wliicli lie makes no mention. The exact 

 locality is where the line of road bounding the townships of Riverview 

 and Kakanni South would strike the river if produced. It is about 300 

 yards west of the outcrop of the lower limestone of his s ction, and dips 

 in the same direction and at the same angle. The rock is breccia, but of 

 a different nature from the mineral breccia higher in the section. It has 

 a fine tufaceous matrix with vesicular masses of basalt, together with tachy- 

 lyte tufi similar to the glass tuffs that are closely associated with the de- 

 posits of diatomaceous earth in the Waiareka Valley, which in the latter 

 locality always lie below the limestone and never above it. As much 

 confusion has arisen in the past through the erroneous correlation of the 

 various volcanic rocks of the Oamaru district, it has been thought advisable 

 to mention this isolated outcrop, for the dip of the beds is exactly the same 

 as the more easterly beds, and, although no actual junction is seen, they 

 undoubtedly form part of the same series. 



The lower limestone is impure and tufaceous, but similar in texture 

 to the typical Oamaru building-stone. It is 35 ft. thick, but the base is 

 not seen. A few brachiopods were collected from the upper 6 ft. of this 

 rock, and the following were identified : *Terebratula oamarutica Boehm 

 and Terehratvlina suessi (Hutt.). 



The limestone is followed by a pure-white foraminiferal marl 24 ft. thick, 

 which contains occasional lines of rounded volcanic pebbles. This bed is 

 capped by 6 in. of limestone, which is followed by 56 ft. of fragmental 

 volcanic rocks. The lowest 16 ft. is a fine volcanic ash. brown to black in 

 colour, but it does not show any minerals. The upper 40 ft. is very con- 

 spicuous from the great abundance of minerals that it contains. Over- 

 Iving these tufaceous beds is a limestone of unknown thickness, but the 

 thickness exposed is about 35 ft. The limestone contains in its lower part 

 much very fine tufaceous matter, and is very friable. The highest 5 ft. 

 of the limestone is more like the building-stone, and it is much harder and 

 more compact than the more tufaceous portion immediately below. From 

 the tufaceous limestone the following species were obtained : Epitonium 

 rugidosum lyratum (Zittel), Pecten aldingensis Tate, P. dendyi Hutt., P. deli- 

 catidus Hutt., Aetheia gaiiUeri (Morris), *Hemithyris sp. nov., Terehratula 

 oamarutica Boehm, Terehratidina suessi (Hutt.), *Neothjris sp. nov., Magella 

 carinata Thomson. 



This assemblage of fossils clearly correlates this limestone with the 

 Kakanui Quarry limestone, to be described in the next section. 



(3.) Sea-coast near Kakanui ToivnsJiip. 



The section to be described is seen on the coast for about a mile north 

 of Kakanui Quarry, and has been described and figured by Hutton (1887, 

 p. 420, pi. xxvi, sec. iv.). Park (1905, pp. 509, 510, figs. 3, 4), and Thomson 

 (1906, p. 484, fig. 1). Hutton and Thomson agree in their interpretation of 

 the stratigraphy, but Park differs from both these obsei"vers. The present 

 writer is satisfied that the latter's interpretation of the succession is due 

 to some error, and as Park in his section (p. 510, fig. 4) shows two separate 

 limestones (Oamaru and Waitaki stones), which he asserts are separated 

 by the Hutchinson Quarry and Awamoa beds — an altogether new inter- 

 pretation of the Tertiary sequence at Oamaru — a rather detailed description 

 will be necessary. 



