30S 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



18 yards, which, lie above the disturbed strata, are omitted in the 

 figure. 



The strata overlying the chalk, as exhibited in vertical section 

 over the line G M in the ground plan, were the following, in de- 

 scending order : — 





• 









Feet 



In. 



Feet In 





Loam, with patches of gravel 



- 



- 



- 



30 









m. 



Sand, with seams of gravel 



- 



- 



- 



21 







51 













Feet 



In. 





1 



Clay - 



. 



- 



- 







6 





k. 



Sand - 



- 



- 



- 



2 









i. 



Dark brown gravel, about 



- 



- 



- 



3 



6 





h. 



Ferruginous sand 



- 



- 



- 



2 









<f. 



Yellow sand, about 



- 



- 



- 



3 



6 





/• 



Ferruginous sand, about 



- 



- 



- 







9 





e. 



Whitish sand, about - 



- 



- 



.- 



1 



3 





d. 



Clay - 



- 



- 



> 



2 









c. 



Yellow sand, about 



- 



. 



- 



1 



6 





b. 



Clay, whitish towards the bottom 



- 



- 



2 











Solid chalk 













19 







Feet 



a. 



70 



I met with no crag shells in these strata at the pit at Thorpe. 



About midway between the points G and m, and near the point 

 o, in the ground plan, some of the lower of the above super- 

 cretaceous strata were faulted in the manner represented in 

 Fig 6., the greatest perpendicular displacement being about 2 feet : 



Fig. 6.* 



but those strata in that section, whose vertical distance from the 

 chalk exceeded 16 feet, remained undisturbed and horizontal. 

 From the sequel it will appear probable that this displacement is 

 owing to the occurrence of a sandpipe in the chalk, to the west of 

 the line g m ; but the existence of such a cavity was not proved 

 in this instance ; for, during my visits to the chalkpit, the clearing 

 of the chalk had not proceeded beyond the line in question. 



* The references to this diagram are given in the above table of the strata 

 overlying the chalk. 



