ZONE OF AMALTHEUS OXYNOTUS. 



53 



raricostatus-zowQ, 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 obtusus- 

 zone. 



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



No. 



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 



LiTHOLOGV. 



Indurated sandy band, with nodules 



of broken fossils 



Blue sliale 



Hardened band 



Blue shale 



Hanlened band 



Blue shale 



Blue shale, with variable indurated 



bands, thick in places 



Hard baud 



Soft clayey band in places 



Hard blue sbales 



Rubbly variegated hard band 



Blue breakable shales 



Rubbly variegated band 



Blue sbale 



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 atone 



Blue crumbly shales, with bands of 



scattered irregular doggers 



Marly stone, with Pentacrinus band 



and cone-in-cone structure 



Shales with many scattered sandstone 

 doggers, and sliell layer towards the 

 base 



Hardened band 



Soft shale 



Whitened calcareous band 



Thick- 



ness. 



ft. in. 



I 6 



8 6 



3 



7 



3 



4 



7 



4 



3 



2 6 



4 



2 10 



3 



10 



2 



1 



3 



3 7 



3 



1 8 



8 



2—4 



8—6 



1 3 



4 



5 8 



5 10 



5 



1 7 



3 



69 7 



Organic Remains. 



Belemnites. 



Pecten priscus, Cardinia hybrida, GryphcBa obli- 



quata, Belemnites. 

 Homomya ventricosa. 



Lima pectinoides. 



These three bands run close together, and make 

 a feature in the cliff. 



Nautilus striatus. 



Pentacrinus tuberculatus. 



Ar. raricostatus, Amal. densinodus, Lima pecti- 

 noides, Pecten priscus, Monotis incequivalvis. 



Pecten catvus, Lima pectinoides, Rhynchonella 

 calcicosta. 



Amal. Simpsoni, Nautilus striatus. 



> Gryphcea ohliquata, Homomya ventricosa. 



Aeg. gagateum, Lima pectinoides, Modiola Icevis, 

 Cardinia hybrida. 



Amal. o.rynotus, Aeg. gngateum, Selemnites acu- 

 tus, Pecten calvus, Protocardium oxynoti. 



Pentacrinus tubercuhitus, Actceonina fragilis, 

 Ilydrobia solidula, Leda Heberti, Lima pecti- 

 noides. 



Aeg. planicosta, Lima pectinoides, Cardinia hy- 

 brida, Gryphaa obliquata. 



