river past river future.ppt [read-only]
TRANSCRIPT
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River Past, River Future:The Importance of Archaeology in River Valley Restoration
Michael WiantIllinois Department of Natural ResourcesIllinois State Museum—Dickson Mounds
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Paleoindian Period(12,000 – 10,000 ybp)
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Mississippian Period(1000 - 600 ybp)
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Native American Tribes
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River Records
Years 9700 170 60 70
Natural (Unwritten) Natural (Written) Profound Change River Transformed
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Records
Records 100 25 100 500
Natural (Archaeology) Natural (Diaries) Change (Biology) Transformed (Biology)
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1835 Illinois River Channel Survey
• 19 or 20 bars where lowest stage was one to two feet of water
• 71 shoals upon which water averaged two to three feet• In low water the river channel was quite narrow, in some
places scarcely wide enough for two boats to pass
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Copperas Creek Lock
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Sanitary and Ship Canal
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Levee Districts
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Dresden Lock and Dam
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Environmental Data from Archaeological Research
• Landform• Sediment• Flora• Fauna
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Landform SedimentAssemblages
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Landscape History: Flood Plain Deposition
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Landscape History: Valley Margin Deposition
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Settlements (n=972)
• Paleo – 1• Archaic – 103• Woodland – 411• Mississippian – 12• Historic – 8
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Climate: Nelson Lake Pollen Diagram
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Prairie Peninsula circa 6,000 ypb
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Flora
• Wood• Nutshell• Seeds• Tubers
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Fauna: Fish
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Fauna: Freshwater Mussels
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Nancy's Point Site
Species 33 18
Prehistoric Modern
After Warren (1995)
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Fauna: Terrestrial
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Wetland Restoration