82 Transactions. 
the Kakanui limestone (or Waitaki stone) ; and (b) that in the Maruwhenua- 
Ngapara area the Oamaru limestone is represented by clayey and sandy 
beds Aon the Liothyrella boehmi zone 
akanui the Kakanui limestone is separated from the gee stone 
by a cor thickness of mineral tuffs, and the outcrops of the t ime- 
stones lie far apart. To the west the tuffs diminish rapidly in КЖ ө. 
and eventually disappear near Weston and Totara. As a consequence of 
this the limestone outcrops converge to the westward, and at Sebastopol 
and in the area lying to the west of that hill the two rocks rest on one 
another, forming one escarpment; but the glauconitic band is always 
present between them, though not everywhere fossiliferous. 
Towards the Waitaki area the Oamaru stone thins out and then dis- 
appears, but the glauconitic Liothyrella boehmi band and the overlying 
Waitaki stone are still present. 
It is noteworthy that the discovery of this useful reference-horizon was 
due to the assiduous and careful collecting of Mr. abai supplemented by 
the pen a e identification of species by Dr. Thom 
The у modification introduced into my Semis (1918) of the 
байкаш by the discovery of the Liothyrella boehmi zone, omitting the 
conglomerate band, which is often absent, is the correlating of the Kakanui 
limestone with the Waitaki stone. Thus we ge 
Awamoan .. = and shelly sands. 
(a) U ео (Waitaki, Kakanui) (Pachymagas parki horizon). 
(b) тека бышы sandstone band (Liothyrella boehmi horizon). 
Ototaran— 
a Mineral tuffs | 
(b) .. Oamaru stone ) 
Waiarekan.. Volcanic tufis. To west and north, clayey and sandy beds. 
Ngaparan .. Quartz sands, grits, and conglomerates, with lignite. 
To west and north, clayey and sandy beds. 
Art. 4.—On the Relation of the Oamaru Limestone and Waitaki 
Stone 
By Professor James Park, F.G.S., F.N.Z.Inst., Dean of the Faculty of 
Mining at Otago University. 
| Read before the Otago Institute, 8th November, 1921 ; received pe Editor, 12th November, 
1921; issued separately, Ist February, 1923.) 
Tae principal theme of a paper by Mr. G. Н. Uttley, M.A., M.Sc., F.GS., 
published in the Transactions of the New Zealand Institute* i is what he calls 
the ** two-limestone theory of Professor Park." Mr. Uttley's contention is 
that the Waitaki stone is the horizontal equivalent of the Oamaru lime- 
stone. In the beginning I may say that I am tempted to deny the gentle 
charge that the invention of what he calls the “ two-limestone theory " is 
mine. Perhaps my disclaimer is unnecessary, since Mr. UttleyT himself 
supplies the correction when he tells us * that McKay's ‘ two-limestone 
theory’ [1877 and 1882] is radically different from Park’s ‘ two-limestone 
theory *” [1905 and 1918]. 
Mr. Uttley rightly quotes me as having written,t in 1887, "Standing 
on the high hills surrounding Ngapara, it is quite obvious that the Ototara 
* Trans. N.Z. a bes 52, 169-82, 1 
G. Н. UrrLE i 139 ace 
tJ. PARK. Eep. "Geol. gm during 1886-87, p. 140, 1887. 
