248 



Proceedings of Indiana Academy of Science. 



liorraiiie shales described above. These were sufficiently striliing, however, 

 to indicate that all such weathering agencies us the above, probably have 

 much more to do with the widening of valleys in native rock formations 

 than has been generally conceded. 



xh 





'^HhjELik_ 



Photo shdwing character of materials at a and b. 



Rough Sketch of Bed of Clifty rreek Showing Special Feature uf b. 



