151 



Rev. P. B. Brodie — Keuper of Warwick. 



Country. 



Temperature Depth 



at surface. below surface. 



No. Name of Spring. 



19 Ems 



20 Bath 



21 Luchon 



22 Bormio 



23 Plombieres 



24 Aix-la-Chapelle 



25 Warazia 



26 Carlsbad (Sprudel) 



27 Aqui 



28 Wiesbaden 



29 Baden-Baden 



30 Gastein 



31 lschia (Gurgitello) 



32 Chaudes-Aigues (Par) 



33 Peters- Spring (Caucasus) .. 



34 Las Trincheras 



1 ■) 



:§ to | Geysers of Iceland 



'g.2 )> ,, New Zealand ... 



,, Yellowstone Park 



It is seen that out of the 34 permanent thermal springs 

 enumerated in the Table, 19, or more than half, have temperatures 

 ranging from 30° to 50° C. (86° to 122° F.), and corresponding to 

 a depth of 600 to 1,200 metres, or about 2,000 to 4,000 feet below 

 the surface, while the average temperature of the Geysers, viz. 

 boiling-point, corresponds to a deptli of 2,700 metres, or about 

 9,000 feet. Great as these depths appear, even the maximum is 

 less than one-third of the aggregate thickness (commonly computed 

 at about 30,000 feet) of the successive formations composing the 

 earth's crust down to the Archaean rocks, and only 0"04 per cent, or 

 -arroth of the radius of the globe (about 4,000 miles). 



I 



III. — On the Sandstones in the Upper Keuper in Warwick- 

 shire. 



By the Bev. P. B. Beodie, M.A., F.G.S. 



HAVE read with much interest Mr. Horace Brown's account in 

 the Geological Magazine for February, 1896, of the boring 

 for water in the Trias at Stratford-on-Avon. In it he makes brief 

 allusion to the sandstones in the Upper Keuper, and refers to Mr. 

 Howell's statement of the occurrence of certain sandstones near 

 Henley-in-Arden. He does not seem to be aware that similar sand- 

 stones are more or less widely spread over a considerable area in 

 some parts of the Midlands, north and north-east of Henley and 

 north-west of Warwick at a higher level, the highest point being 

 445 feet above the level of the sea. Many years ago I noticed 

 some sandstone in Miss Phillips' park at Edstone not given in the 

 Survey Map, and I informed my friend the late Professor Ramsay 

 of the fact. These sandstones may also be seen in many places, 



