GEOLOGICAL NOTES 



At another spot appeared — 



ft. in 

 Clay, clarkeninf; downwards, with a little shell marl 



at its base . . . . . . ..30 



Gravel 



Fit;, j New Reservoirs. Section towards S. end of Mitchley Marsh, seen 



Jul}', Gth, Kjoo Showin},' Clav, darkenins:; towards the bottom, above gravel. 



Height of Section about loft., length aboui 50ft; 



In some places there was nothing that could be called peat, 

 and there were no traces of shell marl, though the thickness of 

 the beds al)ove the gravel was above the average, as in the two 



sections given below : — 



ft. in. 

 Clay, darkening' downwards . . . . 40 



Dark soil . . . . . . . . 10 



Gravel and sand 

 And 



Loani)- clay . . . . . . . . 30 



Dark clay . . . . . . ..26 



Gravel 





Fig. 4. New Reservoirs. Section about looyds. N. of No. i. Showing 



lenticular bed of Shell marl resting on Peat, and covered by the Clay 



forming the surface. Gravel at the base. 



London Clay did not appear in the ordinary sections of 

 10 or II feet from the surface, which all ended in gravel, but it 

 was usually visible at very slightly greater depths in trenches, 

 &c. 



J 



