2I 4 



MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 



Table 5 



Horizon in the Speeton 

 Clay of Shell West 

 Heslerton No. 1 bore- 

 hole, West Heslerton, 

 Yorks. 



Species 



CVS 



in p 



u 



CD 

 «T3 



.a e 



CV~ 



d > 



gH 



N CX 

 &£? 



-C c: 



X! c 



.c -^ 



ft.S 



CV2 



c 

 m 1 rt 





13 CD 



•a s 



i_, re 

 +-> rn 

 it ^ 





en 4) 



8 S 



CD " 



CD J-< 



+-> re 



S *- 



6 Ji 



u-> £ 



9? 





N 3 



0^ 3 



• CX| 

 2*P 



Gonyaulacysta cretacea 



X 



X 









G. palla 







X 







G. helicoidea 







X 



X 





G. axicerastes 









X 





G. orthoceras 













G. episoma 











X 



G. hadra 











X 



G. aichmetes 











X 



Heslertonia heslertonensis 



X 



X 



X 



X 



X 



Heliodinium patriciae 



X 



X 









Hystrichodinium ramoides 





X 









Cribroperidinium sepimentum 



X 



X 









Leptodininm alectrolophum 









X 





Pareodinia ceratophora 





X 



X 



X 



X 



Pseudoceratium (Eopseudoceratium) gochti 





X 



X 



X 





Gardodinium eisenacki 



X 



X 



X 







G. albertii 



X 



X 









Muderongia crucis 





X 









M. staurota 







X 







?W etzeliella neocomica 



X 



X 









Odontochitina operculata 











X 



PBroomea longicornuta 











X 



Doidyx anaphrissa 







X 







Apteodinium maculatum 







X 







Dingodinium albertii 







X 



X 





Netrelytron trinetron 









X 





Paranett -elytron strongylum 







X 



X 





Sirmiodinium grossi 



X 



X 



X 



X 





Cometodinium sp. 







X 







Fromea amphora 











X 



Systematophora complicata 





X 



X 



X 





S. schindewolfi 







X 







Hystrichosphaera ramosa v. ramosa 









X 



X 



H. ramosa mullibreva 



X 



X 



X 



X 



X 



Hystrichosphaeridium simplicispinum 





X 



X 



X 



X 



H. arborispinum 







X 



X 





Oligosphaeridium complex 





X 



X 



X 



X 



0. vasiformum 



X 



X 



X 







0. macrotitbulum 



X 



X 









PCordosphaeridium fasciatum 







X 







Callaiosphaeridium asymmetricum 



X 



X 



X 



X 



X 



Stratigraphical distribution of dinoflagellate cysts in the Speeton Clay of Shell West Heslerton 



No. 1 Bore. 



