188 PKOCEEDINGS OF THE ALBANY MEETING 



action by a bod}^ of this kind wo;ild probably have greater weight, both 

 with the institutions of learning and with engineering societies and or- 

 ganizations, than wonld individuals or small gronps. Eemarks Avere made 

 by Messrs. Tyrrell, Atwood, Lane, Hotchkiss, C. W. Brown, Berkey, 

 Woodworth, Shaw, and Matthew. A motion was made by Messrs. Lane 

 and Atwood that a Standing Committee on Engineering Education be 

 named by the Chair, the President to be one member, and that the work 

 of the committee be directed to the encouragement of increased attention 

 to geologic education, to the collecting of information emphasizing the 

 importance of geological advice in engineering work, and to the recom- 

 mending of other steps calculated to secure the closer working of geol- 

 ogists and engineers. 



The Society then took up the consideration of scientific papers. 



VAPErvS, TITLICS, AND ABSTRACTS OV PAPERS PRESENTED BEFORE THE 

 M()R.YIN(I SESSION AND DISCUSSIONS TPIEREON 



A METHOD OF MEASUI7ING FOST-GLACIAL TIME 



BY W. 0. HOTCHKISS 



CONTENTS 



Page 



Locality selected for sliidy 1,38 



The bottom and hoAv it reached its present condition 130 



Determination of amount of sediment deposited. . 139 



Determination of rate of deposition 140 



Factors affecting accuracy of results 140 



Discussion 141 



Locality selected foe Study 



Lake Mendota, at Madison, Wisconsin, is situated about 8 miles from tlio 

 outermost moraine of tlie Greeu Bay lobe of the latest Labrador ice-slieet 

 Its basin is carved in Upper Cambrian sandstone. Below water level it has 

 fairly steep slopes, down to depths of 60 feet, and a large area, comparatively 

 flat, comprising nearly one-third of the bottom, which lies between the depths 

 of 60 and 80 feet. The bottom deposits are coarse sands in the shallower 

 waters and mud and marl in the deeper portion. These facts are taken from 

 the work of Birge and Juday, published in the reports of the Wisconsin 

 Geological and Natural History Survey. 



This marl and mud deposit has accumulated since the retreat of tlie Green 

 Bay lobe. Obviously, if we could determine the amount of deposit and the 

 rate at which it was deposited, we would have a very definite measure of the 

 lapse of time since the ice retreated fi-om the basin. 



An investigation of these facts is now being planned, and this paper is pre- 

 sented at this time in the hope of receiving helpful suggestions from others 



