16 



ME. G. W. LAMPLUaH OS THE JUXCTIOX OF [vol. Ixxviii, 



50 yards of that last described. In the interval of 150 yards be- 

 tween the section of fis:. 7 and the beginning: of the main easterly 

 working, illustrated in fig. 8, the continuity and yariability of 

 the Basement beds are shown by small exposures which reveal 

 features similar to those illustrated by the two sections here given. 

 When I first examined the Nine Acre pit, in a more southerly 

 workino;-face, the cover of Gault had not set in ; but it bes^an to 

 be visible, along with the iron-grit breccia, at a few spots in 1906. 

 The sections now described are better than any previously seen. 

 The most significant features are the very uneven surface of the 

 lower Sands with evidence of sharp erosion around the bosses of 

 iron-grit, and the absence of the Silty beds (2 of figs. 3, 11, 14) 

 beneath the Basement beds of the Gault. 



W. 



Fig. 7. — Section of tlie xcestern end of Nine Acre ])it, Slienley, 

 Sejjfemher 8th, 1920. Surface, alout 350 feet O.D. 



[Same explanation as fig. 8.] 



Fence 



E. 



Top clay cut back and obscure: 



' , r J J but clear section below working olatform. 



V V' 3 5 \ ards omitted ^ • 



Vertical and horizontal. 



4 -^W^^^r-IQ^ 



3 



Fig. 8. — Section at Nine Acre pit, Slienley, 150 yards east of 

 tlie last (fig. 7) : slioicing tlie western part of tlie main 

 icorking face, September 10th, 1920. 



Surface, ahout 350 feet O.D. 

 W. E. 



2 >ards 

 omitted 



'-' - ' -^ '\'x •^,' ,VA ■ . . .- .\ / .^ 1,'/.^ 7.'[/\ ZYIlV^^- 





z 



ZY 



Vertical: Horizontal slightly reduced 



