io8 



MIDDLE ALBIAN STRATIGRAPHY 



represented remanie in the basal pebble bed of the Carstone ; in the Pays de Caux it 

 is well developed at Cauville. The eodentatus Subzone is represented at the top of the 

 Carstone by sediments containing indigenous Hoplites (Isohoplites) ; in the Pays de 

 Caux it is present but very condensed even at Cauville. The major difference, how- 

 ever, occurs in the Gault. In the Isle of Wight the clays are of lyelli, spathi, and 

 probably intermedins Subzones age, followed possibly directly by some orbignyi 

 Subzone sediments (Upper Albian) ; the bulk of the loricatus and the whole of the 

 lautus Zone being absent. In the Pays de Caux no sediments of any of the Subzones 

 mentioned above have yet been detected. However, the niobe Subzone is present at 

 Cauville, although absent in the Isle of Wight, and the lowest Upper Albian Subzone 

 yet proved is varicosum. 



Bed 



Lithology 



8 



Basal lenticular marly sandstone concretions of the Gaize. s/ 



7 



Light grey micaceous silty malm. 



6 



Mid grey silty micaceous clay becoming a highly glauconitic 

 loam by the middle of the bed. 



V 



5 



Very pebbly Ill-graded greenish loam with pebbly phosphatic nodules. . 



4 



Massive indurated blocks of pebbly pale-brown grit in a matrix 

 of loose similar material. 



3 



Darker brown Ill-graded pebbly grit with streaks of dark grey 

 clay. Lenticles of indurated material occur. 



2 



Loose pebbly brown qrit with little clay. A few scattered phosphates. 



1 



Very coarse brown ill-graded pebbly grit, loamy with streaks of 

 grey brown clay in the middle. Large blocks of brown hard 

 sand stone, as shown, in lower mottled yellow sand 8. fawn loam. 





Ft 



Ins M 



^zz;:ezz 









1 



6 4 ~ 





6-7 



o 3 " 



2- 





1 



6-8 



0-18 







1- 

 6 



(2k 



eB . 









1 



7 



=5&^ ~ "- << 



tc 

 2 



7 

 0- 



Fig. 48. Section in Poudingue and Gault in the sea-cliff on the N. side of Cap de la Heve, 

 100 yds N. of the lighthouse, Ste Adresse, Le Havre, Pays de Caux. 



It is probable that the Isle of Wight and the Pays de Caux belong to two separate 

 depositional troughs (p. 142) and do not form one area of deposition as implied by 

 previous workers. The sediment of the ' Argiles du Gault ' is a sandy loam rather 

 than a clay and small pebbles are present. This together with the Poudingue below 

 indicates the close proximity of a shoreline but outcrop and borehole information 

 indicate that this could hardly be to the south (see p. 142). 



