214 



J. F. BLAKE ON THE KIMMERIDGE CLAY OF ENGLAND. 



Section of Kimmeridge Passage-beds, Weymouth, from the top 

 to the bottom. 



Lithology. 



Thickness. 



Observations. 



Light-coloured clay 



ft. in. 



3" "6 



3 



3 



1 6 

 2 

 5 



2 



2 



1 4 



1 4 

 4 



2 6 



No fossils. 



Yery fossiliferous (see below). 



Exogyra nana, Ostrea deltoidea. 



Indurated bands, Ostrea del- 

 toidea. 



Ostrea deltoidea, Serpula in- 

 test inalis. 



Ostrea deltoidea. 



Very fossiliferous (see below). 



1. Green sandy beds 



2. Rather light-blue clay 



3. Hard yellow limestone 



4. Soft light-blue clay 



5. Hard yellow limestone 



6. Blue clay 



7. Band of oysters 



8. Blue clay 



9. Band of small oysters 



10. Blue clay 



11. Light-yellow hard band ... 



12. Blue clay 



Ironstone band of coral rag 



20 7 



No. 1 has a great variety of fossils crowded against each other ; 

 and though these are moderately large and well preserved, almost 

 every fragment of the bed contains some. It is known to collectors 

 as the Trigonia-hed, from the abundance of T. Meriani. The fol- 

 lowing are the fossils I have from this bed : — 



Ammonites biplex, Sow. 



decipiens, Sow. 



Berryeri, Les. 



hector, D' Orb. 



Belemnites nitidus, Dollf. 



abbreviatus, Mill. 



Turritella minuta, K. $ D. 

 Bostellaria mosensis ?, Buv. 

 Phasianella striata, Sow. 

 Littorina pulcherrima, Dollf. 

 Delphinula nassoides, Buv. 

 Chemnitzia heddingtonensis, Sow. 

 Pleurotomaria reticulata, Sow. 

 Natica eudora, IP Orb. 

 Opis suprajurensis, Cont. 

 Cardium pseudoaxinus, Th. 



pesolinum, Cont. 



Cucuflaea pectinata, Ph. 

 Area mosensis, Buv. 



rhomboidalis, Cont. 



Trigonia Meriani, Et. 

 Pholadidea compressa, Sow. 

 Perna mytiloides, Sow., var. 

 Modiola bipartita, Ph. 

 Astarte ovata, Sow. 

 Lucina substriata, Bom. 



plebeia, Cont. 



GToniomya Monodi, Dollf. 



Thracia depressa, Sow. 

 Pleuromya donacina, Ag. 



tellina, Ag. 



Voltzii, Ag. 



Gresslya ? 



Pholadomya aequalis, Sow. 

 Homomya compressa, Ag. 

 Pecten midas, If Orb. 



Quenstedti, Bla. 



articulatus, Schl. 



Perna lanceolata, Sow. 

 Gervillia, sp. 

 Anomia, sp. 



Lima pectiniformis, Schl. 

 Ostrea deltoidea, Sow. 



intricata, Cont. 



monsbeliardensis, Cont. 



solitaria, Sow. 



Exogyra bruntrutana, Thur. 



nana, Sow. 



Lingula ovalis, Sow. 

 Rhynchonella inconstans, Sow. 

 Serpula intestinalis, Ph. 



runcinata, Sow. 



Vermilia, sp. 

 Eryma Babeaui, Opp. 

 Cidaris norigemma, Ph. 

 Trochocyathus, sp. 



