ZONE OF AMALTHEUS OXYNOTUS. 



53 



raricosiattis-zone, is most valuable for showing the stratigraphical distribution of the 

 Ammonites therein. The upper half of the section, Nos. 1 — 20, represents the rari- 

 costatus ; Nos. 21 — 26 the oxynotus ; and the lower portion, Nos. 27 — 45, the obfusus- 

 zone. 



Section of the Oxynotus-beds, Rohin Hood's Bay. 



No. 



LiTHOLOGY. 



Thick- 

 ness. 



Organic Remains. 



1 



2 

 3 



4 



5 

 6 

 7 



8 

 9 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 



20 



21 



22 

 23 



24 

 25 



26 



27 



28 

 29 

 30 



Indurated sandy band, with nodules 



ft. 

 1 



8 

 



7 

 

 4 



7 

 

 

 2 

 

 2 

 

 

 



1 





 3 

 



1 







2- 

 8- 

 1 







5 



5 

 

 1 

 



in. 



6 

 6 

 3 





 3 

 







4 

 3 

 6 

 4 



10 

 3 



10 

 2 

 

 3 

 7 

 3 



8 



8 



-4 



-6 



3 



4 



8 



10 

 5 

 7 

 3 



Belemnitei. 



Pecten priscus, Cardinia hybrida, Gnjphaa obli- 



quata, Belemnites. 

 Homomya ventricosa. 



Lima pectinoides. 



I These three bands run close together, and make 

 C a feature iu the cliff. 



Nautilus striatus. 



Pentacrinus tiiberculatiis. 



Jr. rarieostatiis, Amal. densinodus, Lima pecti- 

 noides, Pecten priscus, Monotis inaquivahis. 



Pecten calvus, Lima pectinoides, Rhynchonella 

 calcicosta. 



Amal. Simpsoni, Nautilus striatus. 



> Grypheea obliquata, Homomya ventricosa. 



Aeg. gagateum, Lima 'pectinoides, Modiola Icevis, 

 Cardinia hybrida. 



Amal. oxynotus, Aeg. gngateum, Belemnites acu- 

 tus, Pecten calvus, Protocardium oxynoti. 



Pentacrimis tuherculutus, Acteeonina fragilis, 

 Hydrobia solidula, Leda Heberti, Lima pecti- 

 noides. 



Aeg. planicosta, Lima pectinoides, Cardinia hy- 

 brida, Gryphaa obliquata. 



Blue shale 









Blue shale, with variable indurated 

 bands, thick in places 



Soft clayey band in places 



Rubblv variegated hard band 



Blue breakable shales 



Rubbly variegated band 



Blue shale 



Hard band 



Shale 



Hard band 



Blue shales 



Line of fossiliferous nodules 



Blue shales 





Hard limestone band, with erect an- 

 nelid (?) tubes 



Parting of shale. 



Hard limestone band 



Blue crumbly shale 



Hard rubbly stone 



Blue crumbly shales, with bands of 



scattered irregular doggers 



Marly stone, with Petitacritius baud 



and cone-in-cone structure 



Shales with many scattered sandstone 

 doggers, and shell layer towards the 

 base 



Hardened band 



Soft shale 



Whitened calcareous band 



69 



4 



