1921] 



EDWARDS, GLACIAL LAKE LAPHAM. 



99 



which were further removed from the ice than the gravels. The 

 location is shown in the accompanying figure, and the section of 

 the heds there is shown in figure 50. These clays rest directly 

 upon the ordinary till of this region and are separated from it hy 

 a thin hand of rather fine gravel. Above the gravel, the banks of 

 clay and sand are regularly laminated, indicating deposition of the 

 wash from the glacier in the quiet waters of the lake. 



With the extension of the field work over other areas, it is 

 hoped that further evidence of these deposits will be encountered. 



B< m 



Fig. 50. — Section 

 of Pleistocene de- 

 posits on National 

 Avenue, West 

 Milwaukee. (A) 

 Soil, (B) Beds of 

 sand and clay de- 

 posited in Lake 

 Lapham, (C) Del- 

 ta gravels, (D) 

 Glacial till. 



At the present time, no traces of the shore line of this lake have 

 been discovered, but none of the localities where the shore line is 

 to be expected have been particularly examined with that object 

 in view. 



All of the deposits which have been so far observed, lie below 

 the 640 ft. contour, making them at least sixty feet below the esti- 

 mated level of the lake. This fact, together with certain other evi- 

 dence, seems to point to the existence of two or more stages of this 

 lake at different levels. This question will be made the subject of 

 further study as opportunity permits. 



