434 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 7, 



Without much change in general character, these gravels become 

 mixed at the bottom with shells in great numbers. These appear to 

 be always broken, and the few fragments of Ostrea which occur are 

 equally comminuted with the more fragile Cyrencc (mainly G. cunei- 

 formis) which form the main bulk of the shells. I also found two 

 fragments of Pectunculus. Rolled pieces of clay of various sizes 

 abound in the bed. This clay is dark and much resembles some of 

 the bands in the Woolwich beds. 



Section exhibited by Excavations in the West India Docks. 



Present surface... 



Level of water i 

 in the Docks. / 



I It. in. 



)a&b. Clay, gravel, soil, &c. ("made 



earth") U li 



c c. Brown and blue clays with a few 



freshwater shells 4 



d d. Peat, with stems of trees and shells 



in one place I 



f e. Clay of variable character passing 



downwards into sand 2 



/ /. Sand and gravel ; the latter very fer- 

 ruginous at the top. The sand 

 prevailing in the upper part. The 

 gravel much coarser towards the 

 bottom 13 6 



) g. Pebbles and rolled clay, with broken 

 shells ; also (g*) patches of green 

 sand with plant and insect re- 

 mains. 





At the bottom of the excavation occur some patches of greenish 

 sand, .9*, intercalated with the pebbles ; these patches are a yard or 

 more in thickness in places, but seem to be in isolated masses, only 

 extending for a few feet and then abritptly cut off. They contain 



