EES et oS eek ee ae are ae ge Ce eee 
AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
Art. XLVIII —The Distribution and Origin of Drumlins; by 
W. M. Davis. 
The place of Drumlins in a geographic classification—Terminology—General 
Description —Distribution—Origin. 
A CLASSIFICATION of geographic forms may be based first 
on general and special peculiarities of origin or structure, and 
second on degree of development by erosion. One could then 
group together plains, plateans and their derivative forms 
under a name that would denote their formation from wide- 
carried dust deposits: as lava flows of igneous rock fed from 
Am. Jour. Sc1.—Tuirp Sertes, Vou. XXVIII, No. 168.—Dxc., 1884. 
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