120 Transactions. 
limestone commenced in the Upper Eocene and continued until after the 
commencement of the Miocene period, though correlation- with European 
equivalents may be misleading. 
A comparison with the North Canterbury fauna is again suggested by 
these conclusions. In the typical Amuri limestone no molluscan fossils 
have yet been found, but in the Trelissick Basin the local representative 
formation contains a molluscan fauna that appears to be little older than 
that of Target Gully. Lately some Foraminifera have been found in the 
typical outcrop of the Amuri limestone, and Thomson states that Chapman, 
after examining these, has classed the Amuri limestone as of Danian age 
(Thomson, Trans. N.Z. Inst., vol. 52, p. 350, 1920). It is more than , 
questionable whether the Foraminifera give a more reliable indication of 
the age of this formation than the Mollusca that were found in the Trelissick 
Basin. In the overlying Weka Pass stone eight species of Mollusca have 
been found ; all of them are well-known species in the beds that lie above 
` the Oamaru limestone, and most of them have a wide range, though Euthria . 
media, Struthiolaria spinosa, Turris altus, and Dentalium solidum occur but 
rarely below the Oamaru stone. The following list gives the approximate | 
occurrence of the eight species : 
uthria va: Pareora, Wate White Rock. 
Struthiolaria spinosa: Trelissick — Kakahu (?), Pareora. 
Pecten huttoni : Hampden — Awa 
Epitonium lyratum : Hampden — Bas get Gully. 
Turris altus : Otiake~ Pukeuri. 
Teredo heaphyi : Waihao- Target Gully. 
Limopsis aurita : Hampden- Pukeuri. 
Hutton mentions an additional nine species from the Weka Pass stone, 
and they too have an occurrence in strata that lie over the Oamaru stone 
and in some cases beneath it as well. They are as follows :— 
Scaphella elongata : Mount Brown and Awamoa. 
Pleurotomaria tertiaria : Oamaru stone. 
. ziczag : Wharekuri- Oamaru stone. Identification doubtful. 
ma laevigata : Waihola, Cobden, All Day Ba 
Pon williamsoni : Mount Brown beds, Tata Islands, Kawa. 
Pecten fischeri : Awamoa. 
Pecten beethami : Wharekuri -Awamoa. 
Thomson (Trans. . Inst., vol. 52, p. 355) mentions in addition three 
species of Brachiopods from the Weka Pass stone. They are as follows :— 
etheia gualteri : Curiosity Shop, Broken River, Waiareka. 
Pachymagas cottoni: Main and Upper Mount Brown limestone, 
тту. 
Pachymagas huttoni : Maerewhenua limestone 
An inspection of this list shows that the molluscan and brachiopod 
faunas of the Weka Pass stone point to an horizon that is certainly no ot 
lower than the upper part of the Oamaru stone, and it should therefore 
be correlated with that horizon. This opinion is based on long dipen 
i ea 
