20 



Transactions. 



Top. 



) 



Quarry beds and the Awamoa blue clay. The complete sequence in the 

 Oamaru coastal district, east of the Waiareka Valley, is as follows : — 



Blue clav 



Shell-bed 



Greensand with Pachymagas parki 



Greensand with Aetheia gaulteri . 



Nodular bed with Isis dactyla and 



Mopsea hamiltoni 

 Limestone 



Brecciated pillow lava and tuff 

 Mineral breccia . . 

 Marl .. 



Limestone 

 Fine brown tufi 

 Tachylite tufi (fine) 

 Diatomaceous earth 

 Tuff .. 



Awamoa beds. 



Hutchinson Quarrv beds. 



Ototara limestone. 



Waiareka tuffs. 



In the following detailed accounts of sections in the neighbourhood 

 of Kakanui the lists of fossils are the result of determinations of specimens 

 collected afresh by myself, with a few additional brachiopods collected by 

 Dr. Thomson. The species marked with an asterisk have been determined 

 by Mr. H. Suter in the case of Mollusca and by Dr. Thomson in the case 

 of Brachiopoda, the remainder being determined by myself. The lists take 

 no account of earlier determinations, and must not be regarded as complete 

 lists, but rather as illustrations of the fauna. Much promising work still 

 remains to be done before the distribution of the fossils can be accurately 

 known. 



Detailed Account of Sections. 



(1.) All Day Bay. 



This bay is situated in the extreme north-east of the Otepopo Survey 

 District, and the section to be described is exposed on the southern side 



3.68"^ 



Fig. 1. — Section north, end of All Day Bay. a, mineral brecciaj ; b, limestone, 15 ft. 

 thick ; c. concretionary greensand band, 18 in. thick ; d, greensand ; e, greensand ; 

 /, blue clay. 



of Kakanui Point. The point consists of a mass of volcanic breccia, and 

 has been described by Thomson (1906). The section exposed on the coast 

 immediately south of the point is shown in fig. LJ 



•f The " mineral breccia " was so termed by Thomson on account of the abundance 

 of fragments of hornblende, feldspar, olivine, augite, garnets, &c., which it contains. 

 It is easily distinguished on this account from the other basaltic breccias and tuffs of 

 the. Oamaru district. 



X The nature of this section has altered since my visit in 1903, probably hy heavy 

 seas removing gravel fallen down from the cliffs on to the beach, and it is now much 

 clearer. This explains the difference between Mr. Uttley's account, with which I agree 

 entirely, and my earlier account, and probably also explains how Hutton could think 

 there was an unconformity. — J. A. T. 



