SOME ESSEX WELL-SECTIONS. 



51 



[Upper Chalk, 

 257 feet.] 



577 

 578 

 ;82 



Tliickness. Depth. 

 fChalk, with a foot of flints at the fi. in. ft, in. 



base y Z ... 437 7 



Chalk and flints 13 o ... 450 7 



Chalk, with la3-ers of flints at the 



top and at the base, and eight 



others, from 6 inches (most) 



to a foot 54 8 ... 505 3 



Chalk and flint 17 o ... 522 3 



Chalk, with flints at top, at middle 



and at base, 6 and 9 inches 



thick 20 3 ... 542 f) 



Chalk and flints 10 O ... 552 6 



Hard yellow clialk. On getting 



through this (.' and to depth 



of 578| feet) the water-level 



rose nearly 30^ feet 4 o ... 556 6 



White sand, the bottom 4 feet 



"mixed" 6 o 



Sand o 9 



Chalk 4 6 



Sand o 6 



Hard chalk 4 o 



Sand and shells o 9 



Hard chalk 4 3 



Sand and chalk i 6 



Hard chalk 4 o 



Chalk, with flints at top, and with 



30 other layers of flints, from 



3 to 15 inches thick (mostly 



about 6 org) 78 6 ... 661 3 



Hard sandy chalk o 9 ... 662 o 



Hard chalk 5 3 ... 667 3 



Rock chalk, with seven layers of 

 1^ flints 17 9 ... 685 o 



This section seem.s to show the presence of the Oldhaven or 

 Blackheath Beds. 



The occurrence of sandy beds in the Chalk is peculiar, and it is a 

 question whether the.se are owing to infiltration of Tertiary sand down 

 joints, or whether they are merely loose gritty beds in the Chalk. 



562 6 



563 3 



567 9 



568 3 

 372 3 

 573 o 



Foxearth. — T/ie Bre7vefy {Messrs. Jf'artfs). 



Made and communicated by Messrs. Isler and Co. 

 Supply 1,200 gallons an hour. 



Thicknes~ 



Pit [the rest bore 1] — 



[Glacial Drift] Ballast [oravL-r 12 



rn\ • 1 r> -r. I Blue clay lo 



[Glacial Drift ' ,, .,, ,- , 



i- r- -I ■^ Mottled clay • 19 



or hocene J /- / 



-■ ( Green sand ij 



Chalk 04 



Dept!). 



() 

 . IH 



. 28 



• 47 

 . 62 

 . 1 2b 



If any of the beds should turn out to be I-locene, there must be 

 an Dullicr hero, (piitc hidden innlcr Hrifl. 



K 2 



