302 THE GLACIAL LAKE AGASSIZ. 



The marsli wliicli borders the northwest side of the northeast jiart of 

 Maple Lake shows a descent of 5 to 7 feet northwestward, or away from 

 the lake, in its width of 1 to IJ miles. Maple Lake is prevented from flow- 

 ing- in this direction by a beaver dam near the lake. The creek draining 

 this marsh whei-e it intersects the upper beach near the east line of the 

 northeast quarter of section 27, Grove Park, has a height of 1,163 feet. 

 Here the beach sku-ting the north side of the marsh is a flat deposit of 

 gravel and sand, a fourth to a half of a mile or more in width, highest next 

 to the marsh, above -\\'hich it rises 5 to 8 feet in a moderate slope. Its ele- 

 vation in the north half of sections 26 and 27 is 1,169 to 1,172 feet, being 

 even 1 or 2 feet lower than the Attix ridge, which lies some two-thirds of a 

 mile farther north, in the south half of sections 21 and 22. This belt of 

 beach graA-el and sand continues 6 miles in a nearly due-east course, and 

 beyond that it extends still eastward along the north side of a great tama- 

 rack swamp, which begins in section 34, Badger, and is said to be 8 miles 

 long. Maple Lake and this tamarack swamp hold the same relation to the 

 upjier beach ridge, which was a barrier between them and Lake Agassiz 

 and which now wholly or partially obstructs the di'aiuage of these areas. 



Third Herman beach, a small ridge of gravel and sand, extending from 

 southwest to northeast, 8 to 10 rods wide, and rising 4 or 5 feet, crossed 

 by the Crookston road in the southwest qviarter of section 23, Tildeu, and 

 seen to reach at least a mile each way from this road, 1,146 to 1,149 feet. 



Natural surface at the southeast corner of section 15, Tilden, 1,134 feet. 



Fourth Herman beach, crossed by the road to Crookston and Red 

 Lake Falls near the center of the southeast quarter of this section 15, 

 1,132 to 1,134 feet. This is a well-marked gravel ridge, mainly single, 

 but twofold where it is crossed by this road. The distance of 1 mile here 

 between these third and fourth Herman beaches consists of till, with a 

 nearly smooth surface, whicli has bowlders up to 3 and rarely 5 feet in 

 diameter quite numeroiisly scattered over it. Southeastward from the thii'd 

 to the first or upper beach the surface mostly is sand and gravel, with no 

 bowlders. 



