. TYPE AMMONITES— IV Jum 



TABLE \—JURASSI 



I — English Stratal Terms II — English Stage 



Names, etc. 



(a) Sub-divisions {b) Main Divisions 



Wealden Beds, pars 



Speeton Clay, pars 

 — — — — — — (Spilsby Sandstone) 



Upper Purbeck Beds 



Middle Purbeck Beds Purbeck Beds 



Lower Purbeck Beds 



absent ? 



Portland Stone 



"Creamy Limestones") 



Portland Glauconitic 



Beds ("Rubbly Beds") 

 — — — — — — Portland Beds 



Shotover Grit Sands 



Portland Sands 

 Hart well Clay 



Portlandian 



Bononian 



 — — — — — • — Kimmeridge Clay — — — — 



Upper Kimmeridge Beds Kimmeridgian 



absent ? 

 Upper Kimmeridge Beds 



Middle Kimmeridge Beds 



Kimmeridge Clay Kimmeridgian 



Lower Kimmeridge Beds 



Sequanian 



