264 



JUflASSIC CHEO^'OLOGT : LIAS. 



[vol. Ixxiii. 



exhibits these deposits, may well give their name to the age — 

 Hwiccian : it is the age Avhen the Liparoceratida^ were dominant 

 and the Polrmorphidse subservient. The follo^ving Table III 

 gives an interpretation of the evidence in Scottish and English 

 areas. 





Table III. — Hwicciax : Scotland and En&land 







Dates. 





Strata. 









Eemerse. Eaasat. 



Yorkshire 



.' Gloucestee- 



X. Somerset 



.^ Dorset 









sniEE.- 





Coast.-* 



9. 



Oistoceras 



3 







130. \ Oistoceras 

 129. 3 +hecJiei. 













8. 



' henJeyi ' 









126. Involute 

 Androgyn. 

 Jienleyi-ty^e ; 

 davoei. 



7. 



davoci 









125. davoei. 



6. 



(3vd Capricorn). Capricorns, 5 











base of 













Scalpa Sandst. 









6. 



(2iid Capricorn). 



6 



Capricorns, 



Pilley, 



Leckhampton. 







4. 



latcecosta 



X7 



Dndbridge. 



Radstock ; 



12^.^ Androg. 





(1st Capricorn). 



{Androg. 



[Androg. 



Bath. 



123. [• lat(BC':sta 







maculafum, 



lafcecosta) 



(E volute 



122.3 group. 







Androg. 





Androg.) 









lieterogenes 









3, 



Beaniceras ... 



X7 



Hewlett's lload 



Slopes of 



121. [Beani- 







{Beaniceras 



(Yellow Lias) ; 



Dundry. 



ceras :] 









Stow-on -Wold. 



{Beaniceras) 



Liparoceras. 









{Beaniceras) 







2. 



carinafiini 





J.eckbampton ? 

 Hucclecote ? 

 (Stout Acantli.) 





1205. iBeanic.:[ 

 Acanth. 

 carina turn ; 

 Ac. spp. ; 

 Liparnc. 



1. 



cheltiense 



X7 



Cbarlton Kings; 



Radstock : 



120 rt. Liparoc. 







{Lip. hepf- 



Dumbleton, etc. 



Dundry. 









augnlare) 



{L. cheltiense) 



{Lip. zieteni 





1 The numbers refer to beds in 'Geol. Whitby' 2nd ed. Mem. Geol. Surv. 1915, 

 p. 69 ; the strata are about 155 feet thick, Bed 7 being 35 feet. 



- Specimens collected by my father, and personal observations. 



'■^ Mr. J. W. Tutcher's information. 



'i W. D. Lang, Proc. Geol. Assoc, vol. xxv (1914) p. 293 ; the numbers are those 

 of his beds. In regard to this and the following tables, my best thanks are due 

 to Mr. Lang for the great pains that be has taken to supply me with information, 

 sending MS. notes of later researches and sul)mitting specimens — my identifications 

 .are in square brackets. Since this paper was read he has published some of these 

 MS. notes — "The i6ea--Zone' Proc. Geol. Assoc, vol. xxviii (1917) p. 31. 



[X Fauna present, position surmised.] 



