202 Kansas Academy of Science. 



6. In the cases considered thus far we have no carefully 

 prepared topographic maps to give quantitative expression to 

 our facts, but recently some excellent maps have been made of 

 limited areas in southeastern Nebraska. From these we glean 

 a few facts pertinent to our subject. In the northeast one- 

 fourth, section 8, township 3 north, range 17 east, Richardson 

 county, Nebraska, on the Falls City topographic sheet is a sharp 

 peak rising 1,260 feet above the sea and 380 above the river 

 less than half a mile awaj'. It is only 20 or 30 feet higher 

 than several others near by and scattered along the very verge 

 of the upland, and just south of an east-southeasterly course 

 of the Missouri and south of a wide flood plain of that stream 

 stretching north-northwest many miles. A remarkable fea- 

 ture of this case is that upland level to the southwest rarely 

 rises above 1,150 feet. We may add that the upland level on 

 the east and west sides of the river further north is about the 

 same, viz., 1,150 feet. Here again, therefore, we find another 

 example of unusual altitude attained by accumulation of dust 

 from an adjacent river valley, this time on the west side of 

 the river, though still to the southwest of the gathering area. 



7. Quite a different accumulation of loesslike silt was has- 

 tily observed by the writer in the southern Black Hills, not far 

 from Chilson station, in Fall River county. South Dakota. 

 There great dust drifts, 20 to 30 feet high, lie like great snow- 

 drifts. A railroad cut through one showed its homogeneous 

 and structureless nature, and buff color, in all these respects 

 resembling closely the loess along the Missouri river. 



8. The last case we record is at Thermopolis, Wyo. It is a 

 sheet of reddish loam 15 to 25 feet thick, lying on a broad, 

 flat deposit of travertine many feet in thickness and rising 400 

 feet above the Big Horn river, close by. Evidently the trav- 

 ertine was the deposit of the hot springs which are still con- 

 tinuing such work at much lower levels. The upper deposit is 

 much the older, made before the drainage had been lowered. 

 The north side of the travertine-capped ridge is quite abrupt. 

 No theory for depositing the fine loam by water can be reason- 

 ably formulated. It is clearly another case of raising of dust 

 from lower levels up a steep slope and spreading it on the 

 comparatively flat summit. The loam has a distinctly red- 

 dish tint, corresponding to the "Red Beds" which comprise 

 much of the surface on the north. 



