Reviews— F. G. K. Price's Gautt. 327 



quoted from it in Mr. Price's Table. The minor subdivisions noted 

 at Folkestone may be made out at Wissant, but it is not clear that 

 such is the case as regards English localities generally. Westwards 

 the clays of Black Venn probably belong to this zone, and it may 

 be traced northwards for some distance beyond Cambridge, though 

 hardly as far as Hunstanton. There is no palasontological evidence, 

 according to Mr. Price's Table, for its existence further north. 



This Albien, or Lower Gault, underwent in places an extensive 

 denudation, of which at Folkestone Mr. Price's Junction or Nodule - 

 bed is in part the evidence. Upon its remains was deposited the 

 overlapping Upper Gault, which, under various lithological aspects 

 — a grey marl with over 25 per cent, of carbonate of lime at Folke- 

 stone — a glauconitic and cherty sandstone in the West of England, 

 a "red chalk" at Hunstanton and Speeton — forms the base of the 

 Chalk throughout England, itself resting upon a variety of beds 

 where the Lower Cretaceous rocks are absent. Keeled Ammonites 

 are characteristic of this formation, and A. inflatus, as the most 

 abundant and typical, gives its name to the group, which corresponds 

 to the greater part of the Cenomanien. At Folkestone, Brachiopoda 

 are tolerably plentiful, and wherever Kingena lima, Terebratula 

 biplicata, and Avicula gryphceoides are congregated in abundance, we 

 may feel sure that we are on this horizon, even if the characteristic 

 Ammonite fail us for a time. 



The student of Cretaceous Geology will find Mr. Price's publica- 

 tion most useful. The bibliography is brought up to date, and shows 

 how much has been published within the last twelve years — a por- 

 tentous accumulation, if the literature is to go on increasing in the 

 same ratio. This is succeeded by a sketch of the hydrography of 

 the period in North-west Europe, with an indication of the probable 

 limits of the Anglo-Parisian basin at that time. A detailed descrip- 

 tion of the Gault of Folkestone follows, being the substance of the 

 author's paper in the Q.J.G.S. for 1874, with the addition of new 

 matter, and then a brief account of the Gault along its outcrop in 

 the several counties from Kent to Yorkshire. A sketch of the Gault 

 of France, with palaeontological correlations, concludes about 40 

 pages of the text. 



But it is the Table, occupying nearly 40 additional pages, which 

 constitutes the chief value of Mr. Price's book. This enumerates 

 about 800 species, exclusive of foraminifera, and is arranged in 20 

 principal columns as follows : — 1. Junction (basement bed) Lower 

 Gault ; 2. Folkestone, in vi. subdivisions ; 3. Cambridge ; 4. Wis- 

 sant ; 5 and 6. Zone of Am. interruptus in the Aube and Yonne. 

 Junction 7. Folkestone ; 8. Nodules d Epiaster Bicordianus of the 

 Ardennes and Meuse. Upper Gault 9. Folkestone in iii. sub- 

 divisions ; 10. Cambi'idge, derived; 11. Speeton Eed Chalk; 12. 

 Hunstanton Pied Chalk ; 13. Blackdown Greensand ; 14. Wissant; 

 15. Ardennes, Meuse (fossiles en phosphate dechaux); 16. Ardennes, 

 Meuse (fossiles en gaize) ; 17, 18, 19. Other localities in France ; 

 20. Puttenham, Bucks. W. H. H. 



