434 



ME. H. Gr. LYONS OK THE LOISTDON CLAY 



Section of Well at D Lines, South Gamp, Aldershot. 



(Surface 340 r above O.D., formed by the pebble-bed at the 

 top of the Middle Bagshot.) 



Middle 

 Bagshot, 

 53 feet. 



Lower 

 Bagshot, 

 115 feet. 



No. 



1 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 



Description. 



Yellow loam , 



Green sand 



Grey sand 



Mixed green sand 



Dark green sand 



Blue clay, streaky .. 



Blue clay 



Black sand 



Blue clay 



Blue clay 



Mixed sand 



Bed of stone 



Mixed sand 



Mixed sand and clay 



Blue clay 



Yellow clay 



Sandy rock 



Mixed sand 



Blue clay 



Green sand 



Bed sand 



Mixed sand 



Light sand 



Blue clay 



Mixed s clay , 



Mixed and 



Mixed clay and sand 



Thickness. 



Total depth 



ft. 



in. 



ft 



in 

 in. 



15 



6 



1 5 



a 



12 



6 



28 



o 



10 



0 



38 



o 



6 



6 



44 



t T 



a 



i 



6 



46 



o 



3 



<-* 



0 



49 



0 



4 



0 



53 



o 



15 



0 



68 



o 



7 



0 



75 



o 



13 



0 



88 



o 



20 



0 



108 



o 



6 



0 



114 



ill 



o 



1 



0 



115 



lit* 



o 



8 



0 



123 



o 



6 



0 



129 



o 



1 



o 



130 



o 



5 



o 



135 



o 



1 



0 



136 



0 



1 



0 



137 



0 



5 



0 



142 



0 



1 



0 



143 



0 



5 



0 



148 



0 



2 



0 



150 



0 



4 



0 



154 



0 



2 



0 



156 



0 



6 



0 



162 



0 



3 



0 



165 



0 



3 



0 



168 



0 



The rest is blue clay of the London Clay to 500 feet 4 inches, where 

 sand was met with, and a supply of water obtained rising to 48 feet 

 6 inches from the surface. In the London Clay, the following layers 

 were passed through at depths from the surface as follows : — 



ft. 



A layer of stone at 192 



„ pebbles at 207 



223 



227 



„ yellow stone at 249 



„ pebbles at 433 



In this well-section the passage of Lower Bagshot into London 

 Clay is remarkable, and is very similar to that shown at Brookwood. 

 The thick development of clay in the Lower Bagshot at beds 9 and 

 10 in the well-section would seem to furnish a case of a thick 

 lenticular patch of clay in sandy strata similar to that described by 

 Mr. Hudleston at Walton, as no such thickness of clay is found to 

 occur in any surface-sections of the Lower Bagshot round about. 



Coming to the instances of, and arguments for, overlap of the 

 Upper beds and erosion of the London Clay which Mr. Irving has 

 put forward, I cannot say that I have been able to make his con- 

 clusions agree with the facts which I have collected in this immediate 



