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Old Monday, May 16, 2011
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The Ideal Stream Cycle (W.M. Davis, 1880)


1:-Youth
2:-Maturity
3:-Old Age
4:-Rejuvenation



Youth




[B]*V-Shaped Valley
*Rapids
*Waterfalls
*No Flood Plain Drainage Divides Broad and Flat, Undissected by Erosion
*Valley Being Deepened
*General Agreement on this stage, lots of examples [/B





MATURITY(EARLY)






V-Shaped Valley
Beginnings of Flood Plain
Sand and Gravel Bars
Sharp Divides
Relief Reaches Maximum
Valleys stop deepening
General Agreement on this stage, lots of examples



MATURITY(LATE)







Valley has flat bottom
Narrow Flood Plain
Divides begin to round off
Relief diminishes
Sediment builds up, flood plain widens
River begins to meander
Lots of Disagreement from here on; some geologists believe slopes stay steep but simply retreat.





OLD AGE






Very Wide Flood Plain
Land worn down to flat surface (Peneplain)
Resistant rocks form residual hills (Monadnocks)
Pronounced River Meanders
Cut-off Meanders (Ox-bow lakes)
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