432 F. G. H. PKICE ON THE BEDS BETWEEN THE 



scription of the " Craie noduleuse a Inoceramus labiatus" which he 

 makes 75 feet thick. 



The term " white chalk without or with few flints " is probably ex- 

 plained by the lower portion being without flints and the upper part 

 containing but few flints. I draw the line of division about the 

 middle of this bed. 



Dr. Charles Barrois, in his able work ' Recherches sur le Terrain 

 Cretace superieur de l'Angleterre et de l'liiande,' has divided this 

 section very similarly to the way in which I have done, by making 

 the following zones : — ■ 



1. Marne sableuso a zone cle Pecten asper, — my bed I. and, he considers, the 



Warminster beds. 



2. Craie marneuse a Plocoscyphia mceandr'ma, = my bed II., chalk marl with P. 



meandrina. 



3. Zone a Ammonites' varians = my beds III., IV., and V. 



4. Craie argileuse avec bancs durs a A. rhotomagensis,= the lower part, about 



93 feet, of my bed VI., grey chalk with Ammonites rhotomagensis. 



5. Zone a JBelemnites plenus (craie compacte) = the upper 60 feet of my bed VI. 

 These last three zones are included by Dr. Barrois in his " Assise a Holaster 



subglobosus!' The true horizon of Belemnites plenus (yellowish chalk) 

 he considers a remanie bed ; this == my bed VIII. 



6. Craie noduleuse a Inoceramus labiatus, 75 feet, = 32 feet of my bed VIII., 



and 43 feet of my bed IX. 



7. Craie marneuse a Terebratulina gracilis = 75 feet of my bed IX. 



It will be seen that his general divisions are the same as mine, 

 with the exception that my sections are rather more in detail. 



Like results have attended the labours of Prof. E. Hebert, Dr. 

 Barrois, and MM. Pottier et de Lapparent in the Boulonnais, where 

 the same beds have been examined. 



The following is M. Hebert's table indicating his divisions in Nor- 

 mandy : — 



Lydden Spout. 

 Echinoconus subrotundus and 



Craie a Inoceramus 



(Holaster cor-avium. 

 i 



Ech inocon ussubrotund us. 



Terebratulina gracilis. 



labiatus. Inoceramus labiatus. Inoceramus labiatus 



Belemnites plenus. Belemnites 2)lcuus. 



iCraie grise a Holaster subglobosus, 16 m. 



Gres calcareux a Holaster nodulosus, 18 m. 



1 1 41 m. 



Oi 



Glauconie sableuse a Holaster suborbicularis, 



Holaster subglobosus (in part). 



). Grey Chalk and Chalk Marl. 



J 



From the foregoing table it appears evident that the Cenomanian 

 is much more considerable in Normandy than it is with us in the 

 south-east of England — so much so, indeed, that in correlating it with 

 our Folkestone section I have to consider the " Glauconie sableuse a 

 Holaster suborbicularis " (which form is a variety of Holaster Icevis) 

 and the 'Gres calcareux a Holaster nodulosus," which equals " Icevis, 1 " 

 as equivalent to our Chalk Marl and parts of the Grey Chalk. 



The " Craie grise a Holaster subglobosus " may probably be cor- 



