THE HISTORY OF DEVILS LAKE, WISCONSIN 



361 



depression unobstructed. The accompanying table gives the 

 altitudes of well-sites and rock outcrops, depths to sandstone, 

 altitudes of bedrock, etc., for points located in Fig. 2. 



TABLE OF WELLS AND OUTCROPS IN THE PECK BASIN 



From this table and from Fig. 3, it is made clear that the pre- 

 Cambrian surface of this section, as of all portions of the district, 

 was very irregular, and that the post-Paleozoic and pre-Glacial 

 surface sloped north and west from opposite sides of a divide 

 located somewhere near the south end of the present flat. 



It is clear that the ice advancing from the north blocked drain- 

 age in that direction and melting, furnished water which joined 

 with the discharge from Steinke Lake to make a small lake in the 

 Peck basin. The waters of this lake rose rapidly to the level of 

 the divide at the south end of the basin and overflowed westward 

 into Devils Lake. Peck Lake, shallow from the first, was gradu- 

 ally rilled until the lowest point on its bottom was as high as the 

 outlet, and the lake ceased to exist. The filling of the lake must 

 have been accomplished before the retreat of the glacier, for fluvio- 

 glacial material was deposited over the lacustro-glacial material. 

 The Peck dug well (see Fig. 2) penetrates 8 feet of coarse gravel 

 and below that 18 feet of sand. The gravel is fluvio-glacial and 

 the sand below lacustro-glacial. The top of the sand is at 1,212 

 feet A.T., and this is probably the approximate altitude of the 

 pre-Glacial divide. 



From the foregoing it is apparent that all the water from the 

 edge of the glacier in its great complex loop east of Devils Lake 

 flowed into Devils Lake during the occupancy of the ice (see Fig. 1). 



