240 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 3, 1867. 



Terebratula biplicata, Sow. 



obesa, Sow. 



Terebratulina gracilis, Schl. 



Ehynchonella Mantelliana, Sow. 



Exogyra. 



Ostrea. 



Plicatula inflata, Sow. (?) 



Casts of several other bivalves. 



Holaster subglobosa, Leske, sp. 



Micraster. 



Ananchytes. 



Discoidea cylindrica, Lam. 



Diseoidea subuculus, Bronn. 



Cidaris gceptrifera ? (spines). 



Spines of several other species of 



Cidaris. 

 Serpula or Yermicularia. 



d. Other Beds of Bed Chalk. — Besides the beds already described, 

 there are a number of chalk-pits in Lincolnshire where layers of a 

 more or less decided red colour are seen. These for the most part do 

 not present any special points of interest. 



In the deep chalk-pit at Tetford Hill, however, we have a pink bed 

 which extends over a considerable area, like the Louth red chalk, of 

 which bed it may possibly be a continuation. The sketch (fig. 2) 

 shows the succession of beds in this pit. 



Fig. 2. — Section of a ChalJc-pit at Tetford HilL 



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10 



1. Soil. 



2. Chalk rubble. 



3. Soft white chalk in small pieces. 



4. Pale pink chalk similarly "shattered," graduating into the 



white above and below Thickness = 6 to 6 feet. 



5. Soft white chalk 2 feet. 



6. Very hard white bed 2 ,, 



7. " Drab bed" (arenaceous chalk) 1 foot 6 in. 



8. " Knobbly white bed '^ 2 feet. 



9. Very white chalk 12 „ 



In the midst of this occurs a covu'se of hard undivided 

 chalk, called by the workmen " Pot chalk," or " Einging 

 chalk," from its ringing under the hammer. 

 10. Nodular chalk, in which the workmen have bored more 

 than 30 feet. 



The only fossil I could find in the red bed was Terebratula obesa, Sow, 

 The white beds contained many fossils. In the bed 7. a new and 

 puzzling fossil (possibly a Hippurite) occurs. 



