226 



PREGLACIAL HISTORY OF BEAN BLOSSOM. 



Inasmiieli as the greater part of the clay and silt oeciipyinii- the valley 

 floor is precisely the same in kind as that covering- the unglaciated uplands 

 and valley slopes, it is evident that this tilling simply represents the wash 

 and soil-creep from the slopes and uplands on either side. Moreovei', the 

 I'ate of filling was so far in excess of the ability of the stream to carry off 

 its load that the preglacial valley became clogged with the waste to such 

 a degree that the stream now occupying the valley floor is for much of its 

 ct>urse (luite unable to spread its meanders over tlie entire widtli: only at 

 the narrowest sections does Bean Blossom succeed in occupying the i-ntire 

 valley from slope to slope, as seen in sketch map No. I. 



Sketch Map No. I. Section 9, Bean Blossom Townslii]) 



Inasmucli as the filling of Bean Blossom at its mouth and for some 

 little distance up stream is covered over by a patchy film of glacial sand 

 associated witli boulders, composed jiartly of crystalline rocks, the 

 uudei-lying clays, silts, etc., antedate the glacial coating. :\Ioreover. the 

 occurrence of benclies (to be associated with the glacial history) i-esting 

 upon the valley filling also point to the same conclusion, that the present 

 filling of the valley, less the 1)enches and the glacial sands, etc.. near the 

 mouth of the valley, is preglacial. 



The question then arises, what was the topographic expression of Bean 

 Blossom before it was aggraded. There are a number of observations 

 wliich throw some liglit on its early histoiy. but much more data should bo 

 gathered over tlie adjacent area before a detailed analysis can be given. 



