36 - TYPE AMMONITES— IV Feb. 



1923 



Some of the evidence for Table III is given in the following sequences : 



Sequen'ce IV — England, Midlands 



Bucks, Oxon, Berks, presumed sequence — some gaps due to exposure-failure. 

 Brickyards were closed during the war, some have been abandoned and others 

 not re-opened yet. Therefore investigation has been difficult. 



Correlation 

 Pseudovirgatitan 



" pallasianits " 



" lomoiiossovi 



scruposus ? 



[Pseudovirgatites) 



Strata 



1. Hart well Clay 



" Olcostephanus 

 pallasianus " 



2. Crendon Clay 



" Olcostephanus 

 lomonossovi " 



3. Warren Farm Clay 



Orbiculoidea 

 latissima (A.M.D. 



Aulacosphinctcan 



" Aiilacosphinctes " 4. Chawley Beds 



" Aitlacosphindes " ? 



dorsoplanits " 



Physodoceratan 



longispinum 

 (Physodoceras) 



5. Shotover Nodule Band 

 " Perisphindes 

 dorsoplanus " 



b. Tiddington, Oxon, Clays 

 Aptychiis 



pseudomutahilis ? 7. W'heatley Shales 



[Anlacostephaiiii s) 



Exogyra virgula 



pseudomutahilis 8. Stewkley Clays 



{Aidac. eudoxiis) Am. eudoxus (J. P.) 



Rascnian 



mutahilis 9. Shotover, Oxon, clay 



with Rasenia mutabilis 



stephanoides 10. Rid's Hill Clays, Rasenia 



stephanoides 



Localities 



Hartwell and Bierton, 

 Aylesbury, Bucks, 

 brickyards ; Culham, 

 Oxfordshire 



Long Crendon, Bucks, 

 foot of Barrel Hill. 

 Hartwell, in part 



Old clay pits near 

 Warren Farm, Stewk- 

 ley, Bucks 



Chawley, Berks, upper 

 beds ; Tiddington, 

 Oxon, some 20 feet, 

 crushed fine - ribbed 

 Amm. 



Shotover, Oxford, Stone 

 Band ; Wheatley, 

 Oxon, Big Stones ; 

 Tiddington Station, 

 Oxon, well, about 25 

 feet down 



Tiddington Village, well- 

 sinking, clay about 20 

 feet down ; Brill Com- 

 mon ; Stewkley, clay 

 pits in work : all with 

 Aptychiis 



Wheatley, Oxon, oil- 

 shales ; clays north and 

 south of Brill Hill, 

 Bucks ; Rid's HiU, 

 brickyard, E. of Brill, 

 Bucks, (A.M.D. 1907) 



Clay pits in work near 

 Stewkley, Bucks 



Reported H. Salfeld, (Ob. 

 Jura ; N. Jahrb. Min., 

 Beil.-Bd. XXXVII, 

 Tab. I.) 



Rid's Hill, brickyard 



