764 ON THE JURASSIC DEPOSITS WHICH UNDERLIE LONDON. 
Prof. Prestwice said that in the Boulonnais an Oolite of the same 
age as at Richmond rested directly on Paleozoic beds. 
Mr. Crarxe Hawxsuaw said the red-rock specimens were exactly 
like those of the Trias in the Severn Tunnel. 
Mr. A. R. Buyyie asked a question about the quality of the 
water. 
Mr. Homersnam said the water from the Oolite contained 72 grains 
of solid matter per gallon, but was not therefore unfit for domestic 
use; there were 26 grains of chloride of sodium and other mineral 
matter. The quality of the water would probably improve when a 
large quantity had been pumped from the bore-hole. . 
Prof. Jupp said, with regard to the age of the red beds, that Prof. 
Prestwich and he were agreed as to the difference between the 
Crossness and Kentish Town strata and those at Richmond, the latter 
being much more like Trias. But what weighed most with him was 
this—at Meux’s Brewery and at Turnford there were thoroughly 
characteristic Devonian beds ; and, he asked, Were Old Red Sandstone 
beds likely to occur so near to those places as at Richmond? As 
regarded Prof. Hughes’s speculative difficulty, Why should not Oolitic 
beds rest unconformably on Trias? at first he himself had thought — 
the beds might be Old Red, but he had gradually arrived at the 
opinion which he now held. As regards the Neocomian in Meux’s 
well, he had only come to the conclusion of their non-existence 
after very careful examination. Oolitic limestones occurred quite 
at the top of the series; and only 5 ft. below the Gault, he had 
obtained Trigonia costata, var. pullus. He was himself convinced 
that no Neocomian species had occurred in the well. He thought no 
argument could be based on the boulder of coal found at Dover, as it 
was probably carried by an iceberg, possibly from a great distance. 
