| |N. France | S.E. and |
| Zonal fossils used in Britain. | Stages. | and | S. France.|
| | | Belgium.*| |
+-----------------------------------------------+---------------------+----------+-----------+
| / _Ostrea lunata_ (Norfolk) | Danian? | | |
| | | (Trimingham) | | |
| | _Belemnitella mucronata_ | | | |
|A.< _Actinocamax quadratus_ | Upper Chalk | | |
| | = _Inoceramus lingua_ in Yorkshire | Senonian | Flint- | |
| | / _Marsupites_,| _Craie blanche_ | bearing | |
| \ _Marsupites testudinarium_ \ _Uintacrinus_| | chalk. | |
| | | | Marls, |
| / _Micraster cor-anguinum_ | | | sandstones|
|B.< " _cor-testudinarium_ | | | and |
| \ _Holaster planus_, Chalk rock | | | limestones|
+-----------------------------------------------+---------------------+ | (not |
| _Terebratulina gracilis_ | Middle Chalk | | chalky) |
| | Turonian | | with |
| _Rhynchonella Cuvieri_, Melbourne rock | _Craie marneuse_ | | _Hippur- |
+-----------------------------------------------+---------------------+ | ites_. |
| | Lower Chalk, | | |
| | Chalk Marl and | | |
| | Cambridge Greensand | Marly | |
| _Actinocamax plenus_ | Cenomanian | chalk. | |
| _Holaster subglobosus_, Totternhoe stone. | | | |
| _Schloenbachia varians_.