Papers read at the British Association at Montreal. 475 



gradually down to the prairie-level on the east. There is here also 

 some drift, beneath which are very distinct glacial strise running 

 north-north-west. Brachiopoda are very numerous here. At Stone- 

 wall the glacial striee are also very distinct, running in the same 

 direction. 



The author gives lists of fossils from the different localities. In 

 many cases only the genera are as yet determined. The species will 

 be numerous. The following table gives the chief characteristics : — 







Stony Mountain. 







Selkirk, etc. 







Stonewall. 











Lower beds. 



Upper beds. 





Condition 



Eather soft 



Soft 



Very hard 



Hard and flinty 



Action with 



Much efferves- 



Effervescence 



None or slight 



Slight efferves- 



cold acid 



cence 







cence 



Colour 



Mottled, dark, 

 and light grey 



Eeddish grey 



Light grey and 

 ochreous 



Very white 



Fossils 



Numerous 



Many 



Few 



Several 



Type 



Corals and Ce- 

 phalopods 



Brachiopods 



Corals 



Corals 



The relative positions of these, and their equivalents, appear to be 

 as follows, in descending order : — 



Stonewall. Niag^ara limestone. 



Stony Mountain. lyPP^'^J^^^- 

 •' ( Lower beds. 



Selkirk, etc. 



Hudson River. 

 Trenton. 



10. — Tenth Eeport of the Undergkound Waters Committee,^ 



DRAWN UP BY C. E. De RanCE. 



THE Chairman and Secretary of your Committee are both un- 

 avoidably obliged to be absent at the Montreal meeting, which 

 is a source of regret to themselves ; the more so that, this being the 

 case, it has been thought advisable to delay presenting their final 

 Keport on the Circulation of Undergi'ound Waters in South Britain 

 until next year, when the Committee will have been twelve years 

 in existence. During these years particulars have been collected of 

 the sections passed through by a very large number of wells and 

 borings ; a daily record has been obtained of the height at which 

 water stands in many of these wells; investigations have been 

 carried out as to the quantity'- of water held by a cubic foot of 

 various rocks, by Mr. Wethered ; and as to the filtering power of 

 sandstones, and the influence of barometric pressure and lunar 

 changes on the height of underground waters, by Mr. I. Eoberts. 

 During the present year the attention of the Committee has been 

 directed to the remarkable influence of the earthquake which visited 



1 Consisting of Professor E. Hull, the Eev. H. W. Crosskey, and Messrs. James 

 Glaisher, H. Marten, E. B. Marten, G. H. Morton, W. Pengelly, James Plant, 

 I. Eoberts, Thos. S. Stooke, G. J. Symons, W. Topley, E. Wethered, W. Whitaker, 

 and C. E. De Eance (Secretary and Eeporter), appointed for the purpose of investi- 

 gating the Circulation of Underground "Waters in the Permeable Formations of 

 England and Wales, and the Quantity and Character of the Water supplied to 

 various towns and districts from those formations. 



