t 



WARREN UFIIAM — ACCUMULATION OF DRUMLINS. 



shores, local deepening of the ocean, etc. For colors on maps he pre- 

 ferred designating the lithology. 



This paper is printed in full elsewhere in this volume. 



The concluding paper of the morning session was read in the absence 

 of the author by Mr R. S. Woodward : 



FINITE HOMOGENEOUS STRAIN, PLOW AND RUPTURE OF ROCKS 



BY G. F. BECKER 



This paper is printed in full in the succeeding pages of this volume. 



Session of Tuesday Afternoon, August 16 

 The Society was called to order by President Gilbert at 2.10 o'clock. 

 A paper was read by the author under the following title : 



CONDITIONS OF ACCUMULATION OF DRUMLINS 

 BY WARREN UPHAM 



A short abstract of this paper is given in The American Geologist for 

 October, 1892, volume xii, page 218, and it is published in full, with 

 additions, in the same journal for December, 1892. 



Professor R. D. Salisbury remarked — 



It seems to me that the use of the term " englacial drift " is objectionable. I re- 

 gard the foliation of drumlins as due to great pressure. The arrangement of drumlins 

 is not parallel to the terminal moraine ; they are sometimes at right angles to it. 

 Drumlins seem to me to he a normal feature of the drift and ought to be common ; 

 their absence is more singular than their occurrence. Some are found at right 

 angles to the direction of ice movement, but they were always formed near the ice 

 margin, and were englacial and subglacial. 



Mr F. J. H. Merrill remarked— 



I have found Cretaceous rocks in the Long island drift hills, which seem to me 

 to have a bearing on the question and to indicate the subglacial origin of the drift. 



Mr W J McGee said— 



I agree with Professor Salisbury in regarding drumlins as normal phenomena. 

 Their formation is illustrated in homely fashion by the frequent accumulation of 

 masses of debris beneath any heavy body dragged on the ground; they well ex- 



II -Bull. Gkol. Soc. Am., Vol. 4. 1892. 



