86 Reports and Proceeding* — 



standard, and endeavour to show that the French succession is in 

 accord with it, believing that the confusion of French geologists has 

 arisen from their having taken a set of arenaceous shallow-water 

 beds as the standard of their Cenoinanian stage, in a district where 

 these form the local base of the Cretaceous System, and where the 

 typical Albien fauna does not exist. 



Commencing with the English sections, they describe such as serve 

 to establish the succession in the Isle of Wight, Dorset, and Devon, 

 pointing out that the Gault and Upper Greensand are everywhere 

 so inseparably united that it is difficult even to assign limits to the 

 component zones ; further, that the Lower Chalk is clearly marked 

 off from this group, and that no classification can be accepted in 

 England which does not recognize the clear and natural line of 

 division at the base of the Chalk. 



In Devonshire the representative of the Lower Chalk is found 

 in a set of arenaceous deposits which contain a remarkable fauna, 

 some of the fossils being such as occur in the Upper Greensand, 

 some in the Chalk Marl, while many have not been found elsewhere 

 in England, but occur in the Cenomanian of France and in the 

 Tourtia of Tournay. This Devonshire " Cenomian " includes the 

 beds numbered 10, 11, 12, and 18 by Mr. Meyer in his Beer Head 

 section, Quart. Journ. Geol. Soc, vol. xxx (1874), -p. 369. 



Passing over to France, the fine section in the cliffs between Cap 

 la Heve and St. Jouin is described in detail, and the bed which is 

 regarded as the base of the Cenomanian by M. Lennier and Prof. 

 A. de Lapparent is shown to be the representative of the Chloritic 

 Marl of the Isle of Wight ; the Greensand and the Gault below 

 forming, as in England, a separate and independent group of beds. 



An account is then given of a traverse made through the depart- 

 ments of Calvados and Orne as far as Moitagne ; succeeded by a 

 brief account of the lateral changes which take place as the 

 Cenomanien is traced through the Sarthe, this being derived from 

 the publications of MM. Guiltier and Bizet. 



A critical study of the fossils found in Devonshire and Norman (ty 

 follows, with tabulated lists comparing the Devonshire fauna with 

 that of the French Cenomanian, and the fossils of the Norman 

 Cenomanian with those of the Warminster Greensand and of our 

 Lower Chalk. In this part of the work the Authors have received 

 much assistance from Mr. C. J. A. Meyer and Dr. G. J. Hinde. 



Finally, they claim to have defined the limits of the Cenomanian 

 stage in Western France, and to have shown that this group of beds 

 is simply a southern extension of our Lower Chalk, formed in a 

 shallower part of the Cretaceous Sea and nearer to a coast-line. 



2. " The Llandovery and Associated Rocks of Conway." By 

 G. L. Elles and E. M. R. Wood, Newnham College. (Communicated 

 by J. E. Marr, Esq., M.A., F.R.S., Sec.G.S.) 



The discovery of beds with Phacops appendiculatus, Salt., near 

 Deganwy, and of shales with a fauna of Upper Birkhill age close to 

 the town of Conway, indicates that the break between Ordovician 

 and Silurian is smaller in this area than has hitherto been supposed. 





