. The Quarterly journal of the Geological Society of London. es gate of Tournay, on theleft bank of the Scheldt, are some large quarries deeply excavated inthe Mountain or Carboniferous limestone. In one belonging to Carbonnel, the limestone (1) is seen covered as in the accom-panying section, fig. 10, with a well-known member of the chalk,provincially called tourtia (2), above which is white chalk-marl (3),vdth the usual fossils, upon which rest strata (4, 5), referred by and others to the tertiary series, and called in Belgium Lower Landenian. The lowest of these is an arg
. The Quarterly journal of the Geological Society of London. es gate of Tournay, on theleft bank of the Scheldt, are some large quarries deeply excavated inthe Mountain or Carboniferous limestone. In one belonging to Carbonnel, the limestone (1) is seen covered as in the accom-panying section, fig. 10, with a well-known member of the chalk,provincially called tourtia (2), above which is white chalk-marl (3),vdth the usual fossils, upon which rest strata (4, 5), referred by and others to the tertiary series, and called in Belgium Lower Landenian. The lowest of these is an argillaceous greymarl (4), strongly contrasted in its darker colour with the whitechalk-marl. I found in this grey marl (4) a perfect specimen of awell-known chalk fossil, Terehratula gracilis, Schlotheim {T. , *Min. Conch. vol. vi. p. 69, pi. 536. fig. 2), with both valvesunited. With this was Terehratula striatula, in abundance, alsoOstrea (JExogyra) lateralis, Nyst, and a Bryozoon. Reposing on the marl (4) and passing into it at the junction are. 362 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, Fig. 10.—Section near Tour nay. Loess TGlauconite 5 Lower Landenians LGreymarl 4 Chalk-marl Tourtia Carboniferous Limestone 1 beds of a green sandy glauconite (5) 10 feet thick, in the upper partof which layers of cherty stone from 6 to 8 inches thick abound, withcasts of shells. In this glauconite the same Ostrea lateralis andTerehratula striatula occur which are met with in the grey marl(4), so that it seemed to me impossible to draw a line betweenthe beds 4 and 5, or to consider 4* as cretaceous and5 tertiary. The other fossils which I found in 5 con-sisted of a Pholadomya (P. Koninckii ?), Cucullcea, Pinna, Turri-telluy Fusus, Natica, &c., chiefly casts, and these in too unsatis-factory a state to admit of being specifically distinguished. A giganticPleurotomaria, sometimes retaining its shell, is not uncommon inthese beds, and is very unlike any fossil occurring in t
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