TRANSACTIONS OF SECTION C. 



549 



"When this Section met here last, Dr. Buckand advised that the levels at -which 

 the springs from the greensand find their issue should he ascertained, especially 

 near Petersiield. This we have done, and thence have deduced the approximate 

 lieight to which the supply from each area may be expected to rise in the well. 

 The results are as follows : — 



The deep well at Chichester penetrates into the upper greensand, which is 

 there about 80 feet thick. The supply of water from it is, and always has been, 

 small, at no time exceeding 2,000 gallons per day. It appears, however, that when 

 tlie boring was stopped in 18-44, about 370 feet of the bore-rod and the slush- 

 pipe at the end of it were left in the bore ; and as there were no pipes used in the 

 sand it is possible that the lower part of the bore may have been fiUed in again. 

 Under these circumstances the smallness of the supply will hardly enable us to 

 infer what it would be in other cases. 



Coming now to the lower greensand, or sands of the Neocomiau formation, 

 these occur, as a gathering-ground with reference to Southampton, only in the 

 Petersfield district. They consist, from the top downwards, of — 



The Folkestone Beds, consisting of sand and carstone, about 100 feet. 



The Sandgate Beds, consisting of sandy clay, sand, and ironstone, about 75 feet. 



The Hythe Beds, consisting of sand, with some sandstone and chert, 200 feet. 

 Making an aggregate thickness of about 400 feet. 



Beneath these are the Atherfield and Weald clays. 



In the Vale of Wardour Mr. Andrews informs us that there are a few feet of 

 what may be lower greensand strata. 



If this is the case, it follows, as Southampton is 28 miles from this point, and 

 21 from Petersfield, that their thickness beneath Southampton may be taken at 

 about half of what it is at Petersfield, i.e. 200 feet. 



6. Tenth Report on tJie Erratic Blochs of Encjlancl, Wales, and Ireland.^ 



See Reports, p. 243. 



7. Third Beport on the British Fossil Polyzoa. — See Reports, p. 249. 



8. On the Formation of Flints. By Professor W. J. Sollas, 

 M.A., F.B.S.E., F.G.8. 



The ultimate source of the silica, of which flints consist, is admitted to be found 

 in the felspars of igneous rocks. These, upon decomposition, yield about equal pro- 



