888 Transactions. — Geology. 



Ex., 1865, p. 256), and as porcelain jasper from Petrifying Gully, Mount 

 Somers (Geol. Kep., 1873-74, pp. 9, 10) ; by Dr. v. Hochstetter in the tuffs 

 and conglomerates of Coromandel (New Zealand, 1863, Eng. ed., p. 96) ; 

 by Mr. J. C. Crawford, at Kuamahunga (Trans. N.Z. Inst., vol. ii., p. 345), 

 and by Prof. Liversidge at Clutlia, and as green jasper at Moeraki (Trans. 

 N.Z. Inst., vol. x., p. 496). He describes the specimen from Moeraki as 

 follows : — " Variegated with reddish brown streaks ; a little chalcedony on 

 one surface. The green colour is mainly due to the presence of protoxide 

 of iron ; there is also manganese present in small quantity. On heating in 

 a closed tube it decrepitates slightly, blackens and gives off water having an 

 alkaline reaction ; there is a slight empyreurnatic odour evolved." Mr. 

 Buchanan has also mentioned the occurrence of green jasper at the Awatere 

 Eiver (Geol. Kep., 1866-67, p. 35), and Captain Hutton alludes to it near 

 Hongikuri on the Cape Colville Peninsula, where rounded blocks of diorite 

 are encased with a coating of red jasper (Geol. Eep., 1867, p. 8). 



Lyclian Stone. — A specimen of grey flinty slate from Whangarei is in 

 the collection of the Colonial Museum, and lydian stone is also mentioned by 

 Dr. v. Haast, at the Malvern Hills. (Jurors' Eep. N.Z. Ex., 1865, p. 256.) 



Chert and Quartzite are of very frequent occurrence in our metamorphic 

 rocks and silurian beds ; they occur as thick beds in the Lower Devonian 

 formation, where they are fossiliferous ; are met with again in the Lower 

 Carboniferous and Upper Devonian series ; and again in many of the 

 Lower Secondary and Jurassic rocks, where they sometimes occur as fossili- 

 ferous beds. 



Flint occurs in chalk at Oamaru, in chalk marls at the Kaipara and Bay 

 of Islands, and as black and grey masses in Petrifying Gully, Mt. Somers, 

 where also iron flint of a red and brown colour is found. It is mentioned 

 by Dr. Hector in chalk on Campbell Island (Trans. N.Z. Inst., vol. ii., 

 p. 178), and by Dr. v. Haast as filling cavities in the rocks of Canterbury 

 (Jurors' Kep. N.Z. Ex., 1865, p. 256), and in the limestone of Amuri Bluff, 

 (Geol. Eep., 1870-71, p. 38), and Prof. Liversidge (Trans. N.Z. Inst., vol. x., 

 p. 495) mentions its occurrence at Tapanui, Otago, and Whangarei Heads, 

 Auckland. 



Chalcedony. — This mineral has chiefly been found in geodes in the 

 melaphyres and quartz-porphyries of Canterbury, but the specimens are 

 chiefly of an inferior class. They are green, grey, brown, and white, and 

 are sometimes arranged in parallel bands passing into agate or onyx. In 

 the collection of the Colonial Museum, there are specimens from Clent Hills, 

 Gawler Downs, Mt. Somers, and Tokatoka on the Wairoa Eiver. It is 

 mentioned by Dr. Hector (Jurors' Eep. N.Z. Ex., 1865, pp. 266, 437) in 

 the volcanic rocks of Moeraki and Otepopo ; by Dr. v. Haast (Jurors' 



