118 PROCEEDINGS OP THE AMHERST MEETING 



recessional moraines are commonly short, detached sections which can not be 

 correlated along continuous ice-front positions. Some of these drift accumu- 

 lations are open to an interpretation other than that of frontal moraine. This 

 absence of effects is in strong contrast to the topography produced by the 

 gradual shrinkage of a field of "live" ice. 



In the eastern headwaters of the Susquehanna basin and in the Hudson 

 Valley and some of its tributary valleys, long tongues and wide areas of stag- 

 nant ice can be shown to have outlasted the glacio-natant streams and to have 

 existed in part contemporaneously. From the Helderberg escarpment north- 

 ward to Glens Falls remnants of a stagnant field outlived the deep-water 

 flooding of the Champlain-Hudson Valley. 



It is held (1) that the friction of the mountain barrier, the loss of grade 

 due to the subsidence of the crust under the central portion of the Labrador 

 ice-field, and the flotation of the glacier by the sea in the Saint Lawrence Val- 

 ley cooperated to deprive the eastern lobe of the pressure necessary to keep it 

 in motion; (2) that this part of the glacier stagnated early in the period of 

 recession; (3) that much of the topography of southern New England, New 

 York, and northern New Jersey can be best interpreted as due to thick glacial 

 ice melting in situ; and (4) that such phenomena as the late movement of the 

 ice from the Hudson Valley westward up the valley of the Mohawk are best 

 explained as the result of live ice moving into the stagnant field and finding 

 avenues of pressure relief other than overthrusting on the dead ice. 



Read from manuscript. 



PRELIMINARY NOTES ON THE SHORELINES OF GLACIAL LAKE NASHUA, 

 NEAR FITCHBURG, MASSACHUSETTS 



BY THOMAS C. BROWN 



(Abstract) 



This paper described briefly some of the shorelines as they occur in the 

 vicinity of Fitchburg, Lurrenburg, and Townsend. 



Presented without notes. 



1/ I/' OF THE PLEISTOCENE LAKES OF THE BASIN-AND-RAXGE PROVINCE 



AND ITS SIGNIFICANCE 



BY OSCAR E. MEINZER 



(Abstract) 



This brief paper reviews the work that has been done in discovering and 

 mapping the Pleistocene lake beds of the Basin-and-Range province, presents 

 a map showing the 67 known Pleistocene lakes in the province, and suggests 

 a method of comparing the Pleistocene and present hydrology and climate of 

 the region. 



Read in full from manuscript, with lantern-slide illustration. 

 Discussed by W. M. Davis. 



