426 
In section 30, T. 10 N., R. 2 W., there is a convection through a nar- 
row opening in the periphery of the Flatwoods basin to the outwash plain 
at the headquarters of Big Creek. No doubt waters came through this 
opening into the Flatwoods region. ‘The silt flat on the Big Creek side of 
the opening comes up to the level of the opening, while on the Flatwoods 
side it is much lower, due to the sinks at this place. No 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 is 
possible that at times large pieces of floating ice carried glacial materia] ; 
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 No. 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) : 
POV LLG Omer vce cke chal ote ets aes Meee eee e ntetoae te Te 715 
WVOLIAING: Fis cee ees oe 3 OE ast eee ce apie siete tere 690 
Wreaello: Ot 222 ait ee oa eis eae oe» 680 
WELIWING) Le eee. oie bev picen oie ames orate ye ee ake 700 
Wiel ING. 14s rine be tia sr settee s nasse's 660 
WiGLIINO 240 enc. cb ce cease so rioeiys ate ee eee 655 
Inet WOOUSPAGIUNEGL ... cots sme einai elerers «ve TOD 
In other wells it never occurred, or was not identified as such. These 
figures show that the surface of this material was not actually flat, 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 
