936 R OLLIN D. S A LI SB UR Y 



have less confidence than formerly. The phenomenon to be 

 explained is widespread and may involve a much bolder 

 hypothesis. 



Loess-like loam near Camp Douglas, Wis. — In the vicinity of 

 Camp Douglas, Wis., there is a considerable development of 

 loess-like loam which is probably genetically connected with 

 loess, though lithologically not identical with the normal phase 

 of that formation. Nevertheless it frequently appi caches loess 

 very closely in physical character. 



Like Ablemans, Camp Douglas is outside the glaciated area. 

 The station itself is about twenty miles west of the Wisconsin 

 River, on a base-level plain of somewhat extensive develop- 

 ment. About the Camp the general plain is marked by occa- 

 sional notable elevations of sandstone rising up about 200 feet 

 above the flat. To the west there is a dissected plain at a cor- 

 responding elevation. Above this plain, which represents a 

 base-plain older than that already referred to, rise other eleva- 

 tions something like 200 feet higher. These are remnants of a 

 base-plain developed during a still earlier cycle of erosion. The 

 dissected plain which stands 200 feet or so above the railway at 

 Camp Douglas is of sandstone, but it is mantled by a clay-loam, 

 to which the sandstone could hardly have given rise. It is 

 rarely exposed, but about four miles northwest of Camp Doug- 

 las a section may be seen which shows that, in its general feat- 

 ures, it is very similar to loess ; that, indeed, it is indistinguish- 

 able from some of the less normal phases of that formation. 

 The exposure is at the head of a ravine cut into the upper plain 

 referred to, and from its position and relations there can be no 

 doubt of its continuity and genetic unity with the clay-loam 

 mantle which overspreads the plain. 



It is possible that the lowest plain about Camp Douglas was 

 flooded by glacial water during the Wisconsin epoch of the 

 glacial period. It is tolerably certain that the higher plain was 

 not so covered. This loess-like loam is therefore believed to be 

 connected, not with the Wisconsin formation, but with one of 



