Till: CRETACEOUS SYSTEM 



491 



7. Shales with Hoplites Deshayesi 



6. Black clay with Jlulc(>xt<i>iinnus (Simbirskites) Decheni . 



ft. Black clay with Hole. (Simbirskites) versicolor 



4. Sand and phosphatic Modulus, Ifnlc. Kcyserlingi 



3. Calcareous sandstone of Riasan ...... 



2. Sands and phosphate nodules with HoftlUnt nodiger and Hop. 

 kitskpuricus .......... 



1. Sands with Cra$pedit>s su/lihis ...... 



Feet 

 17 



j,. 



5 

 3 



12 

 10 



The four lower zones contain Belemnites lateralis and the two 

 upper Bel. Jasekou'i, neither B. jaculum nor B. brunsvicensis 

 occurring in Russia. 



II. UPPER CRETACEOUS SERIES 



A. STAGES AND ZONES 



As stated on p. 471, the members of this series have a far wider 

 extension than those of the lower series ; they extend southward 

 below the English Channel into France, they pass eastward beneath 

 the eastern counties of England, and below the floor of the North 

 Sea into Belgium and Holland. The following is a tabular view 

 of the stages and zones into which the English Series is divisible, 

 with the names of the corresponding French stages : 



Upper Chalk 



Zones. 

 'Ostrea lnn.it. i 

 Belemnitella mucronata 

 Actinocamax quadratus 

 Marsupites testudinarius 

 Micraster coranguinum 

 Micraster corcestudinarium 

 _Holaster planns 



xiT-jji m 11 f Ti-rebratulina lata 

 Middle Chalk (KhynchonellaCuvieri 

 T^ - PI,. it THolaster subglobosiis 

 Lower Chalk \Schlcenbachia varians 



Selbornian 



TPecten asper 



SchloBnbachia rostrata 



"| Hoplites interruptus 



French Divisions. 



.Douvilleiceras niammillatum 



>Carapanian. 

 ; Senonian. 



rTuronian. 



-Cenomanian. 



-Albian. 



B. CHARACTERISTIC FOSSILS 



The following are some of the species which are characteristic 

 of each of the four stages or subdivisions of the Upper Cretaceous 

 series : 



