122 



THE LIAS AMMONITES. 



Fig. 1.— Profile of Saltmck Nab, south of Wldthy. 



No. 

 1. Cap grit. 



2. Alternations of sandstone and 

 shale. 



3. Dogger, Inferior Oolite. 



4. Cement-nodules in the alum- 

 shale. 



5. Lumpy bed. 



6. Dark alum-shale, with irregular 

 band of nodules. Lowest 

 bed worked for alum. 



7. Thin, flat ironstone band. 



8. Dark alum-shale, somewhat 



harder than the upper strata. 



9. Double band of nodules. 



10. Dark shale, with Belemnites. 



IL Red shale bed. 



12. Hard dark shale : fossils. 



13. Flattened spheroidal nodules. 



14. Hard dark shales. 



15. Band of pyritic nodules. 



16. Hard grey shales. 



17. Jet-rock, hard shale. 



18. Hard shales. 



19. Annulatus-bed of nodules. 



20. Soft shales. 



ft. in. 



Hz. 



cs -c? <=> «=^ «rf e 

 9 A O o . O O 



Irregularly stratified. 



60 Occasional coal-bands, with Zamiacece. 



4 Ferruginous. 



Ilarpoceras hifrons, Stephanoceras commune, Belemnites 

 J'ottzii, Leda ovum. 



34 



;- "- - 



V\C\ 



//A/. 



34 Contains fossils. 



4 Non-fossiliferous. 



18 



1 Ilarpoceras ovatum, Belemnites vulgaris. 



18 Fossils rare, Belemnites top and bottom. 

 6 

 12 Belemnites subtenuis, Inoceramus dubius. 



20 Ilarpoceras serpentinum, Belemnites tubularis, Inocera- 

 mus dubius, Extracrinus Phillipsi, Wright. 



20 



10 



Belemnites tripartitus, Aptychus. 



20 



Stephanoceras annulatum. 

 25 Belemnites cylindricus. 



IRONSTONE SERIES OF THE MIDDLE LIAS. 



