Quart. Journ. Geol. Soc. Vol. LIV, Aug. 1898.] 



UPPER LIAS ^ 



MIDDLE LIAS . 



LOWER LIAS 



Great Oolite, 

 Stonespibld Slai 

 Fuller's Earth. 



Northampton Sax 

 Yeovil Sands. 



SlJlIATULUS-SnXhES 



(Yorksiiire). 



COTTESWULD SaXDS. 



Lower Lias Ola 



Pliensbachien 



Sinemurien 



AppROxiarATB Zonal 



TER>rS CSED By 



Wright. 



nRONOLOQlCAL 



(Zone of A. 



/fl/«s, Tate & Blake', J 



(ZouL of I'c}il> 

 {iiboculafiis tiiicl ) 

 (Uppei BucUaiidi 



bradfordens' 

 Murchisonw. 



opaliniform 



variabilii 

 Lilliai sr 

 bifrontU 



i falcifci 



} aldani 



mcgastOT) 

 piruiorbh 



Oppdia (?) discus. 

 Dictyothijris coarctata, 



Tercbmtula viaxillata. 

 Maa-occpkalitcs svhcon- 



tractits. 

 Oppcfia fiLscu. 



' Steijheorcraii' zUjzatj. 

 Siriqaccrm TriulHi. 

 Par/cbi^onla Garaniiana. 



Ca'/orrras Bhgdeni. 



WifchcHia sp. " 



Sonninia s)i. 

 Hifperlioccraa disciies. 



Brasilia bradfordcnsis. 



Ludwigia MurchisoiKE. 



Hatiyia. variabilis. 

 Lillia Bp, 



Hildoceras bifroiis. 

 Harpoceras falcifcnim. 



(?) aoutum. 



Pcdiopleiaoceras spinaiim 

 AmcUtheiis ■niargariiatus. 

 Liparoccras strialum. 



Ci/doceras Valdani. 

 Uptoniu Javiesoni. 

 Deroccras armatiim. 

 Echioccras rai-icostaium. 

 Oxi/nofoceras oxynoim. 

 Asio 



s stcUare. 

 obitm 



Microderoccras Birchi. 



roiifonie. 

 Schlotheimia Tuarinorca. 

 fVfehncroceras mcyasioma. 

 Psilocei-as planorbis. 



Oiironolooical Tbrhs. 



y Ludwigian Age. 



Stepheocera- 

 tidan Epoch. 



Deroceratan Age. 



)■ Asteroceratan Age. 



J- Calcceratan Age. 



Arietidan 

 Epoch. 



' [I take uo responsibility for the sti-atigi'aphiL'ttl tenns. They are only placed here 



interpreted from the very different views which authorities have as to tlieir use. In fa 



^ I' Chronographe gi5ologi(mc,' 2ud cd., Ooinpte-rendu Vlfime Congr. Geol. lutan. Ziti 



^ [The arenaceous Midford and Cotteswold Sands have been ranged in the Iiiferiur 



oii;rh jnidauce ; 

 i term ditlers -ri 

 His suljilivisiu, 



e exception of the Sands ivhich are placed aecoiding to faunal contents, they an 

 jation, even by the same author, accordinjj to locality.— June ICth, 1898.] 

 rati-iaphieal and elironolo-ical, for Bathoni e ii may cjunlify Stjige or Ago.] 

 heir aii^iUaeeous e(iuivaleiits in other places have been called Lias.J 



