TYLOR QUATERNARY GRAVELS. 



91 



gradient of 1 in 25 in that part. Only 48 feet in height is shown in 

 fig. 23. The sketch is to natural scale ; so that the angles of the 

 escarpment of chalk are not exaggerated. 



Fig. 23. — Section in Gray ford Pit. 



D80. 



88 C. 



W. 



Fig. 24 is a view near the curved line E F, of the eroded surface 

 of the chalk (A), with rearranged Thanet sands (B) 4 or 5 feet thick. 



(West.) 



Fig. 24. — Section in Crayford Pit. 



(North-east.) 



enclosing large flints from the basement-bed. The deposition of 

 6 feet of coarse flint-gravel (C), on the bed B, in a hollow of the chalk 

 excavated prior to the gravel-period, is well exposed just where the 

 tramway cuts through it. 



The brick-earths above the gravel have been excavated. The 

 brick-earth generally is more valuable than the sand and gravel, and 

 the workmen often leav« the lower beds in the state shown in fig. 24 



