Vol.50.] BORINGS AT CULEORD, WINEFIELD, WAKE, AND CHESHUNT. 513 



Dover, which should change places with Richmond, according to 

 northing. Both exceptions, however, are far eastward ; but while 

 the former shows an easterly fall, the latter shows a rise in that 

 direction. They are also the only two borings that have proved 

 the presence of Carboniferous beds. 



That the northerly rise of the older rocks continues underground 

 beyond the neighbourhood of Culford we can hardly expect, and we 

 know that, farther northward (in Norfolk), at Yarmouth, Norwich, 

 Holkham, and Lynn, such rocks have not been reached by borings 

 taken to a deeper level than that at Culford. 



It is noteworthy that the range of depth to the older rocks, over 

 so large a district as that within which the borings occur, varies 

 only to the extent of about 700 feet, and this is between Culford 

 and Richmond, a distance of more than 70 miles. 



Site of Boring. 



Overlying 

 Formations. 



Nature of 

 Older Rock. 



Depth. 



Below 



Ordnance 



Datum. 



From the 

 Surface. 



Culford (Suffolk)... 



Cheshunt( Herts.) \ 



Kentish Town f 

 (Middlesex)... \ 



London, Meux's J 

 (Middlesex)... 1 



Crossness (Kent) \ 



Streatham (Sur- J 

 rey) | 



Harwich (Essex) \ 



Dover (Kent) ... \ 



Richmond (Sur- j 

 rey) j 



Cretaceous... 



Cretaceous . . . 



Tertiary ... "1 

 Cretaceous J 



Tertiary ... 1 

 Cretaceous J 



Tertiary ... "1 

 Cretaceous I 

 Jurassic ... J 



Tertiary ... 1 

 Cretaceous J 



Tertiary... 1 

 Cretaceous L 

 Jurassic ... J 



Tertiary... 1 

 Cretaceous J 



Cretaceous 1 

 Jurassic ... J 



Tertiary... j 

 Cretaceous I 

 Jurassic ... J 



Doubtful , ... 



Devonian 



Red and "1 

 Grey Rocks J 



Red and \ 

 Grey Rocks J 



Red and ~[ 

 Grey Rocks J 



Carboniferous . 



Carboniferous . 



Red and 1 

 Grey Rocks J 



Feet. 



528? 



686? 



870 



930 



981 

 1003 

 1010 



1015 



? 1120 or + 

 1220 



Feet. 

 637f 



796| 

 980f 



1113^ 



1066 



1008 



1120 



1029 

 1157 



1237 



Q. J. G. S. No. 199. 



2n 



