GLACIAL FEATURES OF ST. CROIX DALLES REGION 253 



the hill to the west, which must have been overridden by the ice 

 according to this view, nor has any direct evidence appeared in 

 support of this idea. A further study will be necessary to establish 

 this portion of the border line. South of Dresser Junction the ter- 

 minal moraine was discovered only in a single isolated spot, three 

 miles southeast of Osceola, where, as is strikingly shown in a road- 

 cut, the ice punched against the red St. Croix terminal, leaving the 

 red and gray till in a dovetail contact. That the limit of the gray 

 ice south of Dresser Junction was the western edge of the St. Croix 

 ridge seems probable. 



From so transient an ice advance an outwash plain would not 

 necessarily be expected. In but one place, the Dresser Junction 

 gap, where drainage was concentrated, is gray outwash material 

 seen in any quantity. In the gap not far from the Kewatin moraine 

 at least 10 feet of limestone gravel rests upon the older stratified 

 deposits of the Superior glacier. 



The Minnesota upland, except in the belt of the buried Franconia 

 moraine, and at a few points where hills of red drift protrude, in the 

 northwest corner of the quadrangle, is surfaced by a gently rolling 

 ground moraine with abundant marshes and und rained areas. The 

 thickness of this drift sheet is variable; on the hillside, a quarter of a 

 mile west of the picnic grounds in Taylor's Falls, the older red drift 

 appears at the surface in an isolated spot; at the picnic grounds, and 

 also in some of the cuts along the railroad to Franconia station, 

 between 25 and 30 feet of gray till are exposed. As previously stated, 

 2 or 3 feet is about the mean depth of gray material on the Franconia 

 moraine. The thick sections of gray drift which so greatly exceed 

 the average all occur near the river, suggesting a pre-Kewatin valley 

 or depression favorable to greater accumulation of debris. West 

 of this strip of heavy gray drift along the river — between Taylor's 

 Falls and Franconia — the buried red terminal moraine has been 

 nearly obliterated. 



Work upon the rocks. — Instead of the northwest sides of the Kewee- 

 nawan ledges being planed, as is the case east of the gray terminal, 

 the outcrops west of the river are rounded and polished on the west 

 or southwest slopes. In many cases the work of the red ice is still 

 visible, but the southwest stoss sides, fashioned later, are the more 



