TINTAU BEACHES IN NORTH DAKOTA. 403 



Across an extent of nearl)- 60 miles next northward we have only 

 scanty observations of the Tintah shores, the most important being 1^ 

 miles east of Clifford, where a well-defined gTavel ridge upon an area of 

 till was seen along a distance of 2 miles from south to north. Its crest has 

 an elevation of 1,040 to 1,045 feet above the sea, with descent of a few 

 feet on its west side and of 15 to 25 feet within 30 or 40 rods eastward. 



From the South Branch of the Goose River, 10 miles north of Clifford, 

 a Tintah shore-line, marked in portions of its course by an eroded slope 

 and in other portions by a ridged beach deposit, passes to the north and 

 noi'theast through township 147, range 53, crossing, the railway line from 

 Portland and Mayville to Larimore near the southwest corner of sec- 

 tion 2 and the North Branch of Goose River near the center of this section. 

 Here and onward to the north through the eastern tier of sections in 

 township 148, range 53, and to the north-northwest through the next two 

 townships of the same range, and onward to the Devils Lake line of the 

 Great Northern Railway and to the Turtle River, this shore lies mostly on 

 the eastern slope and near the border of the extensive delta of sand and 

 fine clayey silt brought into Lake Agassiz by the glacial river of the Elk 

 Valley. In section 14, Washington, and tlu'ough several miles northward, 

 the shore bears a well-defined beach ridge, which in the southeast quarter 

 of section 34, Pleasant View, has been excavated to obtain sand for plas- 

 tering. In portions of sections 8 and 5, Pleasant View, and in section 31, 

 Chester, the beach deposit, with crest at 1,050 to 1,055 feet above the sea, 

 changes to a low, eroded escarpment of till 10 to 20 feet high, with its top 

 5 to 15 feet above the beach. The delta here extends nearly or quite to 

 the Tintah shore, which divides it from an eroded tract of till on the east. 



North of the Turtle River, which is crossed by this shore-line 2 miles 

 west of Arvilla, it continues in the same north-northwestward course, cross- 

 ing an area of till. One mile east of Orr's station it is a distinct gravel 

 and sand ridge, and about tln-ee- quarters of a mile west of Inkster it has 

 two beach ridges, the crest of the westei'u one being 1,070 to 1,072 feet 

 above the sea, and that of the lower and less massive eastern ridge 1,060 

 feet. In tiie east edge of section 28, Eden, the Tintah levels of Lake 

 Agassiz are shown by erosion upon the eastwardly sinking till slope. The 



