Occurrence of Boulder Clay at H udder s field. 



221 



foot-bridge, on the right. At this point both streams run over 

 a bed of gravel four feet in thickness. 



Fig. 2 shows the deposits on the left bank of Lees Beck 

 in detail. Below the surface soil (seen on the left of the 

 illustration) is six feet of sandy loam resting on gravel. A 

 sudden change occurs at the point where part of the bank is 

 broken away ; to the right of the two-foot rule, the loam is 

 only four feet six inches thick, the gravel here being one foot 

 six inches thicker than to the left. 



On the opposite (right) bank of Lees Beck, and on the right 

 bank of the Colne, the excavations showed the sands and 



Fig. 2. 



-Sand and gravel, left bank of Lees Beck near junction 

 with the Colne. 



gravels to be nine feet six inches to ten feet in thickness and 



ox-bow of Lees Beck the 



ft- 

 4 

 r 



4 



ins. 

 o 

 o 

 6 



resting on black shale. Near the 

 following beds were exposed : — 



Sandy loam 

 Sandy gravel 

 Coarse grey gravel... 



The latter bed (charged with sewage which percolated 

 into it from the stream) continues to just beyond the con- 

 fluence, and here it contained a number of large water-worn 

 boulders. At this point the bed thins out and merges into a 

 bed of fine grey mud one foot in thickness, resting on a bed of 



1917 July 1. 



