STREAM VALLEYS AND THEIR MEANING 



489 



slip-off slopes. Sweep will lead to asymmetry of the necks of 

 land between the loops.' In time, if the uphft is continued, a 

 . w/ "Vffy""^ single meander may sweep 



If 



more than its width down 

 stream, but before the next 

 one arrives the stream bed 

 will have been so lowered 

 that the characteristic valley 

 form will still be preserved. 

 In time cut-offs may develop 

 in solid rock. As uplift con- 

 tinues and the valley becomes 

 deeper, the amount of ma- 

 terial to be removed by lat- 

 eral cutting, or as a result of 

 lateral cutting, will become 

 so great that further increase 

 in the width of the meander 

 belt may be checked. The 

 valley form may then ap- 

 proximate that shown by the 

 Chaquaqua Canyon, Mesa de 

 Maya sheet, Colo. (Fig. 9). 



The reader has, doubtless, 

 ere this discovered the cor- 

 respondence between these 

 deduced consequences and 

 the features of the ingrown 

 meander type of valley as 

 described above (see also 



Fig. 3)- 



After such a slow uplift, 

 with its consequences as just 

 described, has progressed un- 

 til the stream is incised to a 

 considerable depth below its 



Fig. 9. — A deep valley of the in-grown 

 meander type at the bottom; upper walls 

 noncommittal. From the Mesa de Maya 

 sheet, Colorado. 



MV. M. Davis, "Incised Meandering Valleys," 5»//. Geog. Soc. Philadelphia, 

 IV (1906), 182-92. 



