THE IOW AN DRIFT 



593 



small fraction of the real Iowan drift plain. It embraces the 

 headwaters of Otter Creek, the valley of which belongs to one of the 

 numerous small, exceptional areas in which there is no drift of any 

 kind, neither Nebraskan, Kansan, nor Iowan. Within the southern 

 edge of the map, and at Hazelton, less than a mile farther down the 

 valley, the Niagara limestone is exposed in natural cliffs or quarry 

 faces, forming continuous exposures along the streams in Sections 



Fig. 6. — View taken east of the diagonal road in Section 28, Township 95, Range 

 15, showing typical driftless hills in the belt of country west of the Cedar River. 



2 and 10 of Hazelton Township. A part of Section 2 is included in 

 the map. There are outcrops below the village of Hazelton; and 

 in the roads on the sloping sides of the valley, up to the summit 

 of the slopes, rain, wash, and wear of traffic have exposed the fos- 

 siliferous Niagaran dolomite, so thin and meager is the Pleistocene 

 in this anomalous area. A full discussion of the Niagaran outcrops 

 in this practically driftless valley will be found on pp. 217-20, 

 Iowa Geological Survey, VIII, published 1898. Describing one of 

 the quarries in Section 10, the report says: "The height of the 



