10 



F. L. Kite] tin and J. Pringle- 



irregularly bedded as the Lower Greensand such appearances are 

 not unusual and need not necessarily denote anything more than 

 local erosion and rearrangement." ^ We believe this suggested 

 interpretation of the break to be correct. 



Continued excavation during the period covering our visits has 

 shown much variability in the character and thickness of beds 

 D, F, and G. Bed F may be absent, and G may become locally 



Hori'AonZciL OJTjd VertieaX, Seals 

 ]?IG. 2. — Diagram to illustrate a part of the beds seen in the working-face of 

 Harris's Pit, Shenley Hill. 



The representation is given in simplest diagram form. It reproduces 

 a part of the section actually seen, where the relations of the beds D and F 

 are less confused than is frequently the case. The clayey sand F is present 

 here in fuller development than in other parts of the section exposed at 

 the same time, where the inverted Gault Clay approached closer to the top 

 of the " silver-sands " and the material of bed Dj was more continuous and 

 was in places in contact with the sand bed G. 



The letters are those used by Mr. Lamplugh to distinguish the successive 

 beds. The lenticular masses of Mr. Lamplugh' s bed D are here marked 

 Di and Do for the purpose of distinction. According to the reading of the 

 evidence adopted in this pajjer the age and relations of the strata are as 

 follows : — 



B. Inverted top part of the Upper Gault of the neighbourhood. Only 

 a portion of the inverted mass is shown. 



C and E. Irregular bands of limonite-ironstone, developed along the 

 surfaces of stratigraphical discontinuity and those of more ready permeability 

 caused by disturbance of the strata. Where the topmost band separates 

 the Gault from the limestone-lenticleD2 it occupies a surface of non-sequence. 



Di. Remnants of the basal bed of the Upper Gault in situ, resting 

 unconformably upon the Lower Greensand. 



Do. Inverted lenticular limestone-mass with brachiopods, a remnant of 

 the basal bed of the Cenomanian stage formerly present in the neighbourhood. 



F. Imperfectly bedded clayey sand of the Lower Greensand, of ^x&- 

 tardefurcata age. 



G. Well- bedded fine sand with thin lenticles ot carbonaceous clay and 

 lignite at the base ; Lower Greensand 



H. False-bedded " silver-sand " of the Lower Greensand ; only the 

 upper part shown. 



1 Op. cit., 1903, p. 239. 



