46 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



of about one hundred feet above the river-surface ; and, when mea- 

 sured from the summit of Boulder-clay on the north to the Chalk- 

 Fig. I. —Geological Shetch Map of part of the Valley of the Little 

 Oiise River. 



Fits ^1^^/^ Dournkc 



Ration'/ 



a. Ferruginous sands and coarse flint-gravel, 12 to 15 feet thick. 



b. Boulder-clay in blue and laminated strata, 25 to 30 feet thick. 

 b b. Boulder-clay not laminated, 20 feet thick. 



c. Chalk. 



Fig. 2. — Section across the Little Ouse Valley at the second standi 

 between Thetford and Santon Downham. 



Brick-kiln on the 

 Miindford-road. 



Vertical scale 1 inch to 300 feet. Horizontal scale H inch to 1 mile. 



summit on the south, the valley is from a mile to a mile and a half 

 wide. On the south side, to the extent of three miles parallel with 



