. Geological magazine. ta along the base of the North Downs. (2) Pervious beds of the Lower Greensand, which probably underlie part of theSouthern Metropolitan area, are proved not to reach so far north as Eichmond. Thepresence of pervious beds of the New Eed may possibly be found to compensate insome degree for the absence of the Neocomian as a source of water-supply. (3) The discussion of these facts throws some new light on the problem of theexistence of Coal-bearing strata at workable depths under London. Small particlesof anthracite were found in several of the deeper beds at Eichmond, th
. Geological magazine. ta along the base of the North Downs. (2) Pervious beds of the Lower Greensand, which probably underlie part of theSouthern Metropolitan area, are proved not to reach so far north as Eichmond. Thepresence of pervious beds of the New Eed may possibly be found to compensate insome degree for the absence of the Neocomian as a source of water-supply. (3) The discussion of these facts throws some new light on the problem of theexistence of Coal-bearing strata at workable depths under London. Small particlesof anthracite were found in several of the deeper beds at Eichmond, these beingprobably derived from Coal-seams in the great Palaeozoic axis; but the presence ofJurassic and Triassic strata shows that a greater thickness of strata will probablyhave to be pierced in order to reach the coal than was formerly supposed. The paper concludes with some notes on the very interesting and beautifullypreserved fossils from the Great Oolite beds under London. Geol. Mag. 1884. Decade A S Foorddelet lith. Mintern Bros, imp. Oxfordian ^Lower Oolite Gasteropoda.(Yorkshire, j THE GEOLOGICAL MAGAZINE. NEW SERIES. DECADE III. VOL. I. No. IV.—APRIL, 1884. OK,IC3-I35r^^Xj J^I^TIGLES. I.—Contributions to the Paleontology of the Yokkshiee Wilfrid H. Hudleston, , (Continued from Decade III. Vol. I. p. 115.) (PLATE VT., excepting Figs. 11 and 11a.) Genus Alaria, Lycett, 1850. S in the case of Nerincea, so also in this genns, we are dealing with A its earliest representatives in so far as this district is concerned,since Tate and Blake make no mention of the occurrence of Alariain the Yorkshire Lias. Piette, who accepts with modificationMorris and Lycetts genus for this section of the winged shells, is ofopinion that no truly winged shell has ever been found in the LowerLias of France, though he describes species from the Middle andUpper Lias, none of which, according to his views, pass was in the Lower Oolites that t
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