. Bulletin of the British Museum (Natural History), Geology. 180 H. G. OWEN The earliest Subzone in his scheme is characterized by Sonneratia kitchini Spath. It is rep- resented by sediments in the region of West Dereham, Norfolk, in Casey's view, where its relationship to the earlier Leymeriella regularis Subzone (tardefurcata Zone) and the later Cleoniceras floridum Subzone is not established (Casey 1961, 571). In the Leighton Buzzard district, Bedfordshire, the kitchini Subzone ammonite fauna is mixed with that of the regularis floridum Subzones (Casey 1961, 567-8; Owen 1972). In the S
. Bulletin of the British Museum (Natural History), Geology. 180 H. G. OWEN The earliest Subzone in his scheme is characterized by Sonneratia kitchini Spath. It is rep- resented by sediments in the region of West Dereham, Norfolk, in Casey's view, where its relationship to the earlier Leymeriella regularis Subzone (tardefurcata Zone) and the later Cleoniceras floridum Subzone is not established (Casey 1961, 571). In the Leighton Buzzard district, Bedfordshire, the kitchini Subzone ammonite fauna is mixed with that of the regularis floridum Subzones (Casey 1961, 567-8; Owen 1972). In the Squerryes Estate sandpit at Westerham, the kitchini Subzone fauna is seen to occur below that of the floridum Subzone (Casey 1961, 543). At Folkestone, Kent, the thin kitchini Subzone nodule bed occurs above sediments of reported regularis Subzone age and beneath the mixed floridum and raulinianus Subzones fauna of the phosphatic pebble debris in Bed la (Casey's Bed 33; 1961, 528-30). In the Isle of Wight, the kitchini Subzone is represented within the Carstone Member of the Lower Greensand. This brief review serves to illustrate the fact that kitchini Subzone sediments are very widely scattered in occurrence in England. Moreover, when compared with the sequence in the Mangyschlak Peninsula in the Soviet Union, mentioned below, in which two distinct Subzones have been recognized, it is clear that the English sequence is very imperfect. Yet, there is evidence that both the Subzones recognized in the Soviet Union can be detected also in England (pp. 198-201). Sediments of floridum Subzone age are of widespread occurrence in southern England. The sections in which they are known to be most fully developed at present are the Squerryes Estate sandpit near Westerham, Kent (Casey 1961, 543) and the Coney Hill sandpit near Barrowgreen House, Tandridge, Surrey (Wright & Wright 1948). In the Squerryes sandpit, the relationship between the earlier kitchini Subzone sediments is clearly
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