236 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jail. 18, 



filled with Boulder-clay. This is the only case I have ever observed 

 of pipes so filled. 



Fig. 3. — Section of Pipes, filled ivith Warp-drift and with Crag, 

 in a Chalk-pit at Guest, betiveen Fakenham and Foulsham. 



a. Warp-drift ; sandy loam. 



b. Sand of the Crag. 



Fig. 4. — Section of Pipes filled with Boulder-clay, near Desborough, 

 Northamptonshire (on the Harborough side of the village) . 



a. Boulder.clay : brown clay with chalk.flints, and rolled pebbles and scratched 



fragments of hard chalk, 



b. Whitish fand. "It /-> v. 



c. Ferruginous sandstone. | Lower Oolite. 



Fig. 5. — Section of Pipes in the Boulder-clay, at Eardingham, 

 Norfolk. 



a. Loamy Warp-drhft. b. Boulder-clay, 



r. The same materials as the Boulder-clay, vix. chalk and clay, but 

 containing irregular seams of sand and gravel. 



