226 



PREGLACIAL HISTORY OF BEAN BIX>SSOM. 



Inasmuch as the greater part of the chiy and silt occupying the valley 

 floor is precisely the same in kind as that covering the imglaciated uplands 

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

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

 rate of filling Avas 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 

 course quite unable to spread its meanders over the entire width; only -at 

 the narrowest sections does Bean Blossom succeed in occupying the eutiro 

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



Sketch Map No. I. Section 9, Bean Blossom Township. 



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

 little distance up stream is covered over l)y a patchy film of glacial sand 

 associated with boulders, composed partly of crystalline rocks, the 

 underlying clays, silts, etc., antedate the glacial coating. Moreover, the 

 occurrence of benches (to be associated with the glacial history) resting 

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

 filling of the valley, less the benches and the glacial sands, etc., near the 

 mouth of the valley, is preglacial. 



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

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

 which throw some light on its early history, but much more data should be 

 gathered over the adjacent area l)efore a detailed analysis can be given. 



