102 MIDDLE ALBIAN STRATIGRAPHY 



also presents a comparison with the Albian sequence in the Isle of Wight and the 

 Dorset and Devon coastal area. All three papers ably summarise the earlier 

 literature. 



As Cayeux (1962 ; 2) has pointed out, the stratigraphy of the Albian sediments 

 between Cap de la Heve and St. Jouin needs revision. Such a revision requires 

 patient study because of the rarity of age diagnostic fossils. The following account 

 is quite obviously incomplete but it adds some new information on the succession and 

 provides a much more accurate foundation for the correlation of the sediments seen 

 in the Pays de Caux with those of the Isle of Wight. In this section of the work the 

 full exposed sequence of the Aptian and Albian sediments up to the base of the Gaize 

 is recorded. The terms ' Poudingue ferrugineux ', & ' Argiles du Gault ' of Lennier 

 (1867) cannot be accurately delimited in all the sections. 



It is essential that these sections are worked with the greatest care particularly in 

 the early spring months. Winter frosts and the general freezing of ground water 

 cause the shattering of the Chalk in the cliffs and large blocks can be dislodged merely 

 by the ringing note of a hammer or by the slight vibration of a heavy surf. Major 

 cliff falls are not infrequent during the early months of the year, but the collecting is 

 far better at these times ! 



The sections described below indicate that the cliffs between St. Jouin and Cap de 

 la Heve present a cross section through a depositional trough. The Lower Albian 

 sediments are slightly comparable to those of the Isle of Wight, but those of the 

 Middle Albian are quite different. 



(a) St. Jouin 



The section described in text-fig. 45 is exposed about 300 yds S. of the cliff-top car 

 park west of St. Jouin. It has not previously been described, and includes Lower, 

 Middle and Upper Albian sediments up to the base of the Gaize. Unfortunately no 

 age diagnostic Middle Albian fossils have been found here by the writer and the 

 correlation of this section with that of Cauville (text-fig. 49) is based purely on the 

 lithology, and is, therefore, suspect in detail. 



(b) Cauville 



From approximately 50 yds SW. of the waterfall to about 300 yds NE. of it there 

 are good sections interrupted by cliff falls (text -fig. 46). As Cayeux has indicated 

 (i960 ; 23), there are striking variations in the Poudingue, the sediments of the 

 mammillatum and Ptardefurcata Zones, in this area. This is well shown in the four 

 sections described here for the first time, however, the Middle and Upper Albian 

 sediments remain reasonably constant. 



Beds 1-9 are of Lower Albian, essentially mammillatum Zone, age. In the Bucaille 

 collection in the Museum d'Histoire Naturelle, Rouen, there are three specimens of 

 Hoplites (Isohoplites) and one specimen of Hoplites (H.) which come from Cauville. 

 They are preserved in blackish phosphate with traces of the inner nacreous layer of 

 the shell preserved, and with evidence of pyritic inner whorls and glauconitic loamy 



