514 Reviews — Barrois on the Tipper Cretaceous Beds. 



appears that the English Chalk presents a succession of different 

 faunas or distinct Pal^ontological Zones, entirely comparable to 

 those recognized by M. Hebert in the basin of Paris and to those 

 of the north-west of Germany. 



The work is divided into five chapters, which treat successively 

 of the basin of Hampshire, the basin of London, the Chalk of the 

 North of England, and the Chalk of Ireland. The subjects are again 

 further divided into a geological description of the strata according 

 to their distribution in the different districts. Thus, the Hampshire 

 basin is described under its northern, southern, eastern and western 

 regions. This is followed in the second part by the various move- 

 ments to which the surface has been subjected, such as the oscillations 

 contemjjoraneous with the Cretaceous deposits, and those posterior 

 to them, the relations of the anticlinal lines with former dislocations, 

 and the comparison of the anticlinal lines of the basin of Hampshire 

 with those of the basin of Paris; from which it appears that there are 

 three principal anticlinals in Hampshire, which are parallel to each 

 other, the axis of Kingsclere, that of Winchester, and that of the Isle 

 of Wight and Purbeck. In comparing these with the undulations of 

 the Chalk in the basin of Paris, described by M. Hebert and others, 

 M. Barrois considers that the first is coincident with or a prolonga- 

 tion of the axis of Artois, the second with that of the valley of the 

 Bresle, and the third with that of Bray. 



A similar treatment is adopted in the chapter on the basin of 

 London, the second part describing the causes which have brought 

 about the variations of the Chalk of that region, either anterior to, or 

 contemporaneous with, or posterior to, its deposition ; followed by a 

 description of the denudation and the effects which have, with the 

 previous oscillations of the surface, produced the general physical 

 features, and the formation of basins and valleys. The Chalk of the 

 North of England and that of Ireland forms the subject of the 

 next two chapters ; the former describing the Chalk of Lincolnshire 

 and Yorkshire, and its comparison with that of Norfolk. This 

 northern division is also considered comparable with the Cretaceous 

 strata of North-west Germany, and therefore somewhat analogous 

 in this respect with the Lower Cretaceous strata (Speeton beds) of 

 Yorkshire, as shown by Mr. Judd. 



The Chalk of Ireland is fully described, both as regards its 

 different lithological character and according to its different zones 

 and contained fossils, of which the following table is a resume, show- 

 ing their comparisons with that of England, from which it appears 

 that in Ireland there are no Cretaceous beds older than the zone of 

 Fecten asper. 



Ireland. 



A. "White Chalk with flints Zone of Bel. mucronata \ 



B. Ditto „ Mnrmpites Senonien 



/-I m-i •l- rw. n ( ,, Micraster cor-anquinum i 



C. Chlontic Chalk \ " ,^. , , ,.^ . ) 



( ,, Mic. cor-tesUtdinarium } 



D. Chloritic Sand and Sandstones ...f " ^olasJe7'Pla7tus [ Turonien 



{ ,, Tereoratuhna gracilis ) 



E. Grrey Marls and yellow Sandstones ,, Molaster subglobosus ^ Ceno- 



F. Glauconitic Sands „ Fecten asper j manien 



