182 E. Andrews on Human Antiquities at Abbeville, &e. 
times that of the ordinary summer stream of the Somme. The 
facts are these: the mass of the upper gravels consists of chalk 
flints mixed with angular fragments, powder of crushed chalk 
Amiens, where the perpendicular bank showed a fine section of 
the phenomena. At this place the strata of gray gravel 
in such a way as to leave the clay stratum in that singular po- 
sition, and equally impossible for water to deposit 1 originally 
in The conclusion is inevitable, that a mass 0 
some material was imbedded there which occupied the space 
until the gravel covered it and the clay stratum was laid over 
i allowing the clay 
least of frozen gravel and ice combined, with enough of 
