14 



CRETACEOUS GROUP. 



A TABLE OF THE CRETACEOUS GROUP OF ENGLAND. 



SUBDIVISIONS. 



LITIIOLOGICAL CHARACTER. 



LOCALITIES. FOREIGN EQUIVALENTS. 



'Upper Chalk 



Lower Chalk, and 

 Chalk-marl. 



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Nearly pure carbonate of lime, with 

 minute fragments of Shells and 

 Foraminifera, forming a 'white or 

 yellowish-white, soft Chalk ; the I, 

 upper beds of which are interstra- 

 tified with layers of flints, or tabu- 

 lar layers of dark silex coincident 

 with the stratification. 



Hard Chalk, without flints, sometimes 

 passing into Chalk-marl or hard 

 . Gray Chalk. 



Isle of Wight, 

 Lewisham, Grays, 

 Northfleet, Nor- 

 wich, Brighton, 

 Dover, Flam- 



borough Head. 



Dover, Folkestone, 

 Lewes (Sussex), 

 Swaflham, Nor- 

 wich. 



Craie blanche, French. 

 Obere Kreide, Germans. 

 ) Etage Senonien, d'Orb. 



) 



Untere Kreide, Germans. 

 ^Planer, Germans. 

 Craie tuffeau, French. 

 Etage Turonien, d'Orb. 



Chard, Chardstock, N 

 Light-coloured marl, full of green gt Catherine's 



Chloritic Marl ...\ specks of silicate of iron, withA Down i s i e 



"l 



numerous fossils. 





of 



Wight. 



crayeuse, 



Upper Greensand 



Gault . 



Siliceous sand, or nearly calcareous 

 sand, with green grains ; the rock 

 often contains nodules of chert and 

 masses of limestone. 



1 Isle of Wight, 

 Dark-blue tenacious clav, sometimes 

 J • . I Folkestone, Char- 



] marly, with some concretions. > 



' Warminster, De- / 

 vizeSjChuteFarm, 

 Petersfield, Cam- 

 bridge, Char- 

 mouth, Dorset. 



Glauconie 

 French. 

 \Tourtia, Belgians. 

 Griinsand, Germans. 

 Etage CSnomanien, d'Orb. 



Red Chalk 



Speeton Clay. 

 [Upper part.] 



Lower Greensand 



A thin bed of hard, red Chalk, deeply 

 coloured by the peroxide of iron, 

 and having numerous small sili- 

 ceous grains and pebbles of quartz, 

 &c, strewed throughout the mass. 



'A grayish-coloured clay, the upper 

 portion containing Neocomian, the 

 lower portion Portlandian species 

 of fossil shells. 



A great arenacous formation, com- 

 posed of ferruginous sands with 

 green grains, dark-coloured clays 

 and clayey sands ; and in some 

 localities,bands of limestone known 

 as Kentish Rag. 



Hunstanton Cliff, 

 Norfolk ; Filey 

 Bay, Yorkshire. 



Filey Bay, York- 

 shire. 



Isle of White, 

 Folkestone, 

 Hythe, Maid- 

 stone. 



yGault, Germans. 

 Etage Albien, d'Orb. 



Terrain Ne"ocomien stipe- 

 \ rieur of Swiss and 

 French. 

 Etage Aptien, d'Orb. 



