Sketch-Map 



shewing- the outcrop of the Gault 



and subsurface water- contours in the Chalk 



9 of HERTFORDSHIRE. 



B 



a r. i. ©Royston 



Ashwell w 



Toddingrton o 1 *^ 



Tilswor 



Baldock 



©Therfield 



Barkway 



/ /#„ ©Buck\land 



'Shitlington / / Sandon I 



Hitchin 



— <£ y^Rushden 3 o>^ 



, V* 



IWeston,' 



.-ftp 



• l ^ Luton 



— , — «ft^ @ Bunting-ford 



C ottered 

 ^\ v % ^ ^ •Walkern 



I btevenage 



'® St. Paul's Waldcn 



Dunstable 



Scale: 8 miles to an inch. 



Notes: Subsurface water-levels referred to Ordnance Datum shewn thus — -»— i» 



Line of outcrop of Gault-clay shewn thus j&&&&% % 



Line of outcrop of Greemand not shewn. 



Fig. 3. 



Sketch -Map 

 shewing the outcrop of the Gauit 



and subsurface water- contours in the Chalk «*„•.. 



Swindon j.^Bishopstonc 



.0? 



of WILTSHIRE 



/^ Market 

 ™Lavington 



Rush all 



O ' 



Warminster 



Heytesbury 



^Tilshead 



Notes: Subsurface water-levels referred 



to Ordnance Latum shewn thus ^V25£x 



Line of outcrop of Gault-clay thus... 

 Line of outcrop of Greemand not shewn. 



