On the Sand-Pit at High Ongar , Essex. 
85 
Beds in conjunction with the older formations in the same 
delineation, I accompanied it by a copy of the Ordnance ten 
miles to the inch Index-map coloured (in MS.) geologically, 
on which I inserted by careful reduction from the one inch to 
the mile sheets the contours of all the arcs which were the 
subject of the paper on the River-valleys of the East of 
England in the Phil. Mag., and with that minuteness and 
care which the scale of that map allowed, and in which they 
consequently strike the eye more clearly than in the litho¬ 
graphed map to the last-mentioned paper. This manuscript 
map I presented in 1866 to the Library of the Geological 
Society, where it can be seen on application to the Librarian. 
Wickham Bishop, Essex. Fig. 1. — Mr. Dalton’s representation with 
assumed fault. Fig. 2.—Suggested correction by sinuosity in the fold. 
c. Glacial Gravel; d. London Clay ; e. Beading Beds; /. Thanet Beds ; 
g. Chalk. 
I have added, in manuscript, to the plate of my paper on 
River-valleys of the east of England placed in the Club’s 
library, a copy of the section at page 25 of the Geological 
Survey Memoir for sheet 12, 10 which crosses one of the Isle 
of Wight arcs, and shows the flexure there; and have indi¬ 
cated the direction of it on the map by the line marked 
“A—B” there. I have also added a copy of the section in a 
chalk-pit N. of Barkway, on the Royston escarpment brow 
10 ‘ The Geology of South Berkshire and North Hampshire. Illustrating 
Sheet 12.’ By H. W. Bristow and W. Whitaker. London, Geological 
Survey. 
