Figure 8. Development of present-day relict and modern floodplain surfaces. (1) Sanga- 

 mon (S) interglacial stage. (2) Entrenchment (scouring) during waxing Altonian sub- 

 stage. (3) Farmdalian (F) interglacial with substage alluviation filling in the former 

 entrenched valley. (4) Entrenchment during waxing Woodfordian substage. Remaining 

 Farmdalian (F) deposits are also known as Deweyville (or Terrace I). (5) Post-Wood- 

 fordian alluviation forming modern day Holocene floodplain surface (M) about 4-5,000 

 years ago. Drawings highly modified from Saucier and Fleetwood (1970). 



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