Quart. Journ. Geol. Soc. Vol. LII. 



[To face p. 192. 



Comparisons op the Yorkshire and Lincolnshire Infra-Cretaceous Strata by the various Authors undermentioned. 



G foloRioal Surrey in ' The 

 of III.' Country iir id Lh 



hes JurasaiqueS et ( 



mp. des Naturalist! 



G. W. Lamplugh in * On the Speeton Clays and their Equi 

 shire,' Abstract in Report Brit. Aason. 1890, p. 60-\ ;ilsn in ' 

 et leurs equivalents,' Moscow, p. 210. 1891. 



Iqmvalcmts 



in ' Ar ; ;ilrs 



'feS^ton A ' PaV J°T <f a * lo T w & *f "E^) j? 'Argilw. f de Speeton et leura Univalents.' pt. Hi.. Bulletin 

 F d « ] » 9oo. Imp. dea Naturahstes cuj Moscon, vol. v. n.s. pp. m & 455. 1891-92. 



lien, d'Orh.) \ 



Upper Neocomian. [ 

 L d'Orh., Rho-^ 



Middle Xeoc^mian. | 

 (Urgonien.<f Orft.,Bar-j 



J.i ill.- \,\ue clay wit 

 f.Ai fn^ils <zoneof>80 



Clays with septaria 



Lower Neocomia>\ | 



Nr-oi-.:mi-'n, d'Orft..^ 

 VaUn^inien & Neo- I 



TiTHOyiAX, Oppel. 



Red Rock. Hunstanton Red Rock. 



Unconformity. 



I 120 Upper SandB? 



Blue clays ('zone of) 



Blue clays ('zone of(_ t 



Blue pyritic clays J 



T, ;:( ]l.v S,-. 



Lower Sands and Sand- 



I" •..:;. iMOJiMi : 



Portlandian ClayB, etc. 



Upper ( 

 Middle 



Z a Pevten cint 



Z. a Olcostepham 

 icolor et O. fa 

 tfalcatus. 



Cn\\r\u>* a Hoptitcs Des- 

 Itfu/i^; ilc Speeton ("" 



Z. a BoplHes noricus 

 (amblygonius) et 



,i7 r ,'"i"""' ■ 



I. a Perisphiact 

 biple.>(Patlasiift 

 rinj-i/u*. Fortlai). 



Z. o. Hoplites eudoxus 

 etMrogyrawrgul- 



knnmcnd-nn. 



'Dimilii.Meycria o 



Caleaire de Tealby a Pec- 



11. (type). ' 



)ouohe8 a B. lateralis 

 Phill.(eorpw/e»*i<s,Nik.) 

 Olcostepkanus subditus 

 Oiynoticeras catenula- 



Portl. inferieur et parti 

 la plus superieure d 

 Eimme'ridgien detruit 

 et remplactte par un 1 

 de rognons phosphn 

 tiques avec JJelemnitt 



Perisph. du groupe i 

 qati, Lwgxtla ova 

 Discina Humphries* 



Tgile d. 



..... 



Clasby a Hoplites nori 



! t ,„},i/,.x !„?(■>-,.,/,*, I'll: 



(. ir r „t tl itu8. Nik.), et 

 Ofcostephanvs st 



(Pc.rtlnndien infe" 

 d< irint a IVpnqnr ,| t . h 

 fcrmation du rtgb de 

 SpilBby.) 



Speeton, Yoi 



Red Chalk. 

 Zone A.— MarlB with Belemnites 



ZONE C— Zone of Belemnites jacidum. 



Upper Kimeridge S 



B.— Zone a Hoplites Dexkayesi et BeUmniles 



C 1 to C 6. — Zone a Olcostcphanus Dtcheni 



lone a Olcostepham 



ft Hl>''''/0>lrllSiS. 



C8 toCll.-Zon. 



mis, O.JTeyserlingi; BettiHititen la it 



Olcostephanus grovestfar- 



Beh' untiles lateralis, ate. 



Couches a Ho r : 



Argile de Tealby. 



Civ-i <\f Spil-I.y a i>h,,s'cphanu8 subdilus. 



