388 Transactions.— Geology. 
Ex., 1865, p. 256), and as porcelain jasper from Petrifying Gully, Mount 
Somers (Geol. Rep., 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 Ruamahunga (Trans. N.Z. Inst., vol. ii., p. 845), 
and by Prof. Liversidge at Clutha, 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 haying an 
alkaline reaction; there is a slight empyreumatie odour evolved." Mr. 
Buchanan has also mentioned the occurrence of green jasper at the Awatere 
River (Geol. Rep., 1866-67, p. 85), 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. Rep., 1867, p. 8). 
Lydian 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’ Rep. 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' Rep. N.Z. Ex., 1865, p. 256), and in the limestone of Amuri Bluff, 
(Geol. Rep., 1870-71, p. 88), 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 River. It is 
mentioned by Dr. Hector (Jurors’ Rep, N.Z. Ex., 1865, pp. 266, 437) in 
the volcanic rocks of Moeraki and Otepopo; by Dr. v, Haast (Jurors’ 
