Note.  The  letters  used  in  this  and  in  the  following  sections  to  indicate  the  solid  geology  are  the  same  as  those  used  in  the 
Geological  Survey  Map  :  As  =  Chalk,  i'=l’hanet  Sand,  ?=WooIwioh  and  Reading  Beds,  i*=London  Clay,  f*=tower 
Bagshot  Sand,  is  =  Middle  Bagsbot  or  Bracklesbam  Beds,  i7= Upper  Bagshot  Sand. 
Fig.  I.— Section  from  the  Roman  Road ,  near  Silchester,  to  the  hills  near  Stoke  Row. 
