426 



In section 30, T. 10 X., R. 2 W., there is a connection through a nar- 

 row opening in the periphery of the Flatwoods basin to the outwash plain 

 at the headquarters of Big Creek. Xo doubt waters came through this 

 opening into the Flatwoods region. The silt flat on the Big Creek side of 

 the opening conies up to the level of the opening, while on the Flatwoods 

 side it is much lower, due to the sinks at this place. Xo doubt that at one 

 time the slope was gradually away from this opening on the south side. 



It is evident that the fluviatile conditions existed for a long time, long 

 enough to fill practically the entire stretch from the place of the entrance 

 of the waters into the region to where they left in the vicinity of Freeman, 

 with the material which has been described. These waters, being so inti- 

 mately connected with the glacier, carried much of its material, and it im- 

 possible that at times large pieces of floating ice carried glacial material ; 

 thus one may expect to find glacial pebbles and even small boulders in any 

 part of the region covered by these waters. 



Indications show that for a long time there were no rapidly flowing- 

 waters in the Flatwoods region. In nearly all of the deeper wells and in 

 many of the shallow ones the very fine sandy blue clay, which has been 

 described in well Xo. 6 is characteristic of the lower material. This blue 

 clay is thicker, perhaps, than any other material laid down. It can be 

 seen in the bottom of the middle branch in the small adjunct of the Flat- 

 woods region. Here it is as described, but reveals another feature quite 

 important. Where it has weathered, or has been eroded, it shows laminae, 

 indicating that it is a water-laid material. This delicate bedding of lami- 

 nation cannot be detected in the clay when it is cut into. The elevation of 

 this material as found in the wells is as follows (See map for location of 

 wells) : 



Well Xo. 5 715 



Well Xo. 7 690 



Well Xo. 10 680 



Well Xo. 11 700 



Well Xo. 14 660 



Well Xo. 24 655 



In Flatwoods Adjunct 705 



In other wells it never occurred, or was not identified as such. The-e 

 figures show that the surface of this material was not actually flit, but 

 that it was even flatter than the present surface of Flatwoods. It is very 

 probable that before later material was deposited upon it. it was eroded in 



