Notices of Memoirs — E. W. Buche — Geysers of New Zealand. 39 



II. — Ojst the Steatigeaphical Position of the Salt Measures of 

 South Durham. By G. A. Lebour, M.A., F.G.S., Professor of 

 Geology in the Durham College of Science, Newcastle-upon-Tyne. 



THE beds above the main mass of the Magnesian Limestone in Durham 

 are seldom exposed at the surface, as the south of the country is 

 covered by a thick spread of drift. The presence of salt deposits 

 having, however, been proved some years ago in the adjoining part of 

 Yorkshire near Middlesbrough, several borings for working them in 

 the form of brine were soon put down in the flat country between the 

 Tees and the coast south of Seaton Carew. There are now altogether 

 some fifteen or sixteen such borings, most of which have reached beds 

 of salt at depths varying from 600 feet to over 1200 feet. These have 

 thrown much light upon the rocks, hitherto scarcely known in this part 

 of England, which lie between the Rhsetic and the great Permian 

 Magnesian Limestone of Durham. The author exhibited sections of 

 these beds, and gave reasons for suggesting that much of the Salt 

 Measures of this district is probably the representative of the Upper 

 Permian or Raiichtvacke of Germany. 



The following table summarizes fairly the classification tentatively 

 suggested by the author : — 



^«)«ci«^a cowtorte beds (proved in Eston shaft and boring) ... Ehaetic. 

 7. Eed and green marls, witb gypsum (known only south of ) 



Tees) > Upper Trias. 



6. Red sandstone ) 



Uncoi)formity (?) 



5. Red sandstones and marls (? Lower) Trias. 



Unconformity (?) 



4. Red marly sandstones, marls, with lenticular beds of \ jj p 



anhydrite, gypsum, and salt, and fcetid limestone in > ^R , , v 



• 1,1 1, i i. J J.1 u I (Kaucnwacke). 



variable bands towards the base ; ^ ' 



3. Main Magnesian Limestone ) t\t-jji t> 



2. Marl slate with fish-bed J Middle Permian. 



1. Yellow sands Lower Permian. 



Unconformity . 

 Carboniferous Rocks. 



III. — Geysers of the Potorua District, North Island of New 

 Zealand. By E. W. Bucke. 



THE author of this paper has recently returned from the Lake 

 district of New Zealand, where he spent eighteen months, and 

 had exceptional opportunities for making observations upon the 

 volcanic phenomena of the district. The largest geyser in New 

 Zealand, that of the White Terrace of Potomahana, is now destroyed ; 

 the three next in size are those of Pehutu, Waikiti, and Wairoa, all of 

 which are situated close together at the back of the native village 

 named Whakarewarewa, about three miles to the south of the Potorua 

 township, and these are particularly described in the present com- 

 munication. The author was able to determine by soundings the depth 

 of the tubes of several geysers of this district, and in the case of an 

 extinct one, that of Te Waro, he was let down the tube. He found 

 that this tube, at a depth of 13 feet from the surface, opened into 

 a chamber 15 feet long, 8 feet broad, and 9 feet high, and that from 

 one end of this chamber another tube led downwards to an undeter- 

 mined depth. 



