116 MESSES. A. J. JIIKES-BKOWNE AND W. HILL : [May 1 896, 



Feet. 

 ^8. Firm grevish- white chalk, with layers of chert- 

 nodules 30 to 40 



7. Greyish glauconitic chalk, with cherts and hard 

 calcareous concretions and many brown 



phosphatic nodules in the lower part 10 to 11 



Cenomanian. ■{ 6. Greyish- white or yellowish chalk, with many 

 layers of greyish-black chert. A bed of hard, 

 grey, shelly, glauconitic chalk occurs in the 

 middle at St. Jouin, but dies out westward ... 70 to 80 

 5. Bluish-grey, sandy, and very glauconitic marl 



^ with many black phosphatic nodules 3^ to 6 



f4. Bluish-grey, sandy, glauconitic marl with layers 



Gaize and J of hard siliceous concretions 23 to 26 



Gau£/t. j 3. Dark grey, nearly black, sandy, glauconitic 



I clay with phosphatic nodules at the base 10 to 11 



„ . f 2. Coarse, brown, pebbly sandstone 15 to 16 



/aptien. j^ Fine, yellow, micaceous sand :.... 70 



Upper Neocomian Sands— Aptien. 



The sands which form the base of the Cretaceous series at La 

 Heve are yellowish, fine, and micaceous, easily dug with the fingers, 

 and veined or streaked with red-brown iron oxide, which frequently 

 cements the grains together in thin platy pieces. Near the top are 

 some concretionary masses of ironstone. 



Immediately overlying these sands, and sharply divided from them, 

 is a bed of brown, pebbly, sandy grit, closely resembling uncon- 

 solidated Carstone. Many fragments of fossil wood occur in it ; other 

 fossil remains are rare, but M. Lennier has obtained Ostrea aquila 

 and Ammonites Milletianus. 1 Like all the beds of the lower part of 

 the Cretaceous series, it thins to the southward ; its thickness nearly 

 a mile east of Cape La Heve is 16 feet, while at Ste. Adresse, south- 

 west of the headland, its thickness has diminished to 11 feet. 



The sequence of these beds has been differently classified by 

 French geologists at different times. 



The yellow micaceous sands and the brown pebble-bed above 

 them, Nos. 1 and 2 in our section, were first regarded by Prof. 

 Hebert in 1 872 2 as ' Neocomien snperieur,' which was his name for 

 the Aptien of d'Orbigny. In 1875, however, he was inclined to 

 range these sands with the Gault, because he had found fragments 

 of Ammonites Milletianus in the sands near Octeville, and because 

 M. Lennier had obtained fossils identified as Ammonites Delud, 

 Trigonia Fittoni, and Nautilus Bouchardianus from these sands at 

 Havre. The two beds are so exactly the counterpart of those at the 

 summit of the Lower Greensand in the Isle of Wight, and described 

 in the Survey Memoir under the name of ' Sand Bock Series ' and 

 ' Carstone,' that we cannot help thinking that Prof. Hebert's first 

 opinion was the correct one. Certainly it would be strange for 

 the species above mentioned to occur in an Aptien sand, but 

 M. Lennier informs us that he is by no means certain of the 

 identification of these fossils. 



1 Eecorded by Prof. Hebert, Bull. Soc. Geol. France, ser. 3, vol. iii. (1875) 

 p. 516. 2 Ojp. cit. ser. 2, vol. xxk. p. 449. 



