The Llandovery and Associated Rocks of Conway, 147 



the beds numbered 10, 11, 12, and 13 by Mr. Meyer in bis 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 Mortagne ; succeeded by a 

 brief account of the lateral changes which take place as the Ceno- 

 manien is traced through the Sarthe, this being derived from the 

 publications of MM. Guillier and Bizet. 



A critical study of the fossils found in Devonshire and Normandy 

 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. E. Wood, Newnham College. 



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. 



In the paper a full description of the representatives of the 

 Birkhill, Gala (Tarannon), and Wenlock beds is given, and the 

 distribution of the fossils (chiefly graptolites) in the various sub- 

 divisions is recorded. Many of the graptolites are forms which 

 have been described from Swedish deposits, but have hitherto been 

 unrecorded in this country. 



3. ' The Gypsum Deposits of Nottinghamshire and Derbyshire/ 

 By A. T. Metcalfe, Esq., F.G.S. 



The gypsum deposits of these counties occur in the Upper Marls 

 of the Keuper division of the Triassic system. The author describes 

 their occurrence in thick nodular irregular beds, large spheroidal 

 masses, and lenticular intercalations, and their association with satin- 

 spar, alabaster, selenite, and anhydrite. 



