26i 



of the Mississippi. Normally the point where a tributary valley joins a 

 larger one is marked by a notch in the wall of the latter, but in some cases 

 a bisected spur appears instead. The delta of Canadice outlet, mentioned 

 above, furnishes a good example. A delta at Lake Warren level, near 

 East Bloomfield, what is left of it, has the form of a single narrow tongue 

 more than a half mile long. Such lateral deposits of a stream may be 

 called levee deltas. 



Hanging deltas have been the chief guides to geologists in mapping 

 the outline of temporary glacial lakes, but they are worthy of more careful 

 study as simple and well displayed specimens of constructional shore 

 forms. 3 



State Normal School, 

 Terre Haute, Ind. 



3 Nearly all the features mentioned in this paper may be found upon the Way- 

 land, Naples, Honeoye and Canandaigua sheets of the Topographic Map of United 

 States. 



