DE RANCE : UNDERGROUND WATERS IN LTNCOLNSHIRE. 
Feet. 
Upper Upper Kimeridge Clay ... » 
j Oxford Clay \ 800 
Middle < Kellaway Rock ... ... ..10? 
I Basement Clay ... ... ... 18? 
•J / [ Combrash ... ... . . ... 5 
'% ) ! Great Oolitic Clay 25 
O Oolite < _ L . ... _. J > 100 
Series | Great Oolitic Limestone ... ... 15 
IJJpper Estuarine Beds ... .. 35 
Inferior ( Lincolnshire Limestone ... .. 60 
' Oolite t Basement Beds (Northampton Beds) ... 30/ 
fUpper Lias ... ... ... ... 100 j 
o J I Marlstone Rock-bed (represented by clay) 20 I 
1< Lias, j ' Middle Lias Clay ... ... ... 15 ? 971 
^ J [Lower Lias ... ... ... ... 814 | 
Rhsetic ... ... ... ... 22 ! 
I' Keuper Marls ... ... ... 725 
Kenper Sandstone .. ... ... 249 
Trias J Upper Soft Sandstone... ... .. 206 1 
Pebble Beds 113 ^ 7n 
I Lower Soft Sandstone ... ... ... 223 
f Upper Marls ... ... .. 118^ 
§ \ Upper Magnesian Limestone ... ... 44 
'S { Permian < Middle Marls ... ... ... 140 > 521 
f2 i 1 Lower Magnesian Limestone ... ... 26 
( Marl Slates ... ... ... 193, 
Carboniferous Upper Coal Measures. . . ... ... 1 0 
An examination of the table of the sequence of the rocks dis- 
closes that though there are no less than 15 water-bearing horizons, 
half of them are only 30 feet in thickness, or less, and though valu- 
able for supplies to private dwellings are of no use for a public water 
supply. This can alone be afforded by the following: — (1.) The 
Middle Chalk, 164 feet ; (2.) The Lincolnshire Oolite and Notting- 
hamshire Sands, together about 90 feet ; (3.) The New Red 
Sandstone, in four horizons, together 791 feet. 
