398 Transactions. — Geology. 



always a characteristic form), Athyris [Clavigera of Hector), 

 Patella, Pentacrinus, fragments of saurian bones, and corals. 



The Clavigera beds correspond approximately with the 

 Otapiri series of the Geological Survey. 



Contemporary Eruptive Eocks. 



At Nugget Point a dyke of augite porphyrite is intruded 

 between the Spiriferina and Halobia beds. It has already 

 been referred to in that portion of my paper dealing with 

 Nugget Point district. Elsewhere the Shaw's Bay series 

 seems to be free from igneous intrusions, although it should 

 be noted that in north Otago and upper Rangitata they contain 

 massive beds of greywacke. 



Nomenclature. 



The name "Shaw's Bay series" was first applied to the 

 Trias of Nelson and Southland by Dr. Lauder Lindsay as 

 far back as 1857. Afterwards, in 1873, Sir James Hector 

 set Lindsay's name aside, substituting the name " Wairoa 

 series," which at that time embraced the whole of the Trias.''' 

 Subsequently, in 1877, the name " Wairoa series " was re- 

 stricted to the Upper Trias, as follows : — \ 

 ry ■ \{a.) Wairoa series. 

 \{b.) Te Anau series. 



In this sense the name was used up till 1878, when Mr. 

 Cox subdivided the Trias into " Upper Wairoa series " and 

 '• Lower Wairoa series," which together now embraced the 

 whole of the Trias. In this new classification, however, 

 the Clavigera (Otapiri) beds were referred to the Lias and the 

 Kaihiku beds to the Permo-carboniferous.J 



In the Geological Survey classification of 1879 the Wairoa 

 series is placed m the Middle Trias, with the Otapiri series 

 above and the Oreti series below, as follows : — § 



" X.— Trias. 

 " (a.) Otapiri series. 

 " (6.) Wairoa series. 

 " (c.) Oreti series." 



In the classification of 1880 the Wairoa series appears in 

 the Lower Trias, || and in tliat of 1881 again in the Middle 

 Trias, between the Otapiri and Oreti series. If In the last 



♦ Reps. Geol. Expl., 1876-77, p. v. 



t Loc. cit., p. V. 



J Reps. Geol. Expl., 1877-78, p. 37. 



I Heps. Geol. Expl., 1878-7'J, p. 10. 



II Keps. Geol. Expl., 1879-80, p. iv. 

 If Reps. Geol. Expl., 1883-84, p. xiv. 



