1.Packrat Midden Analysis, since late Pleist. –Sonoran Desert History (veg & climate) 2.Alluvial...
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Transcript of 1.Packrat Midden Analysis, since late Pleist. –Sonoran Desert History (veg & climate) 2.Alluvial...
![Page 1: 1.Packrat Midden Analysis, since late Pleist. –Sonoran Desert History (veg & climate) 2.Alluvial Stratigraphy, since early Holocene –Dry-wet and/or warm-cool.](https://reader036.fdocuments.in/reader036/viewer/2022062313/56649d3b5503460f94a16498/html5/thumbnails/1.jpg)
1. Packrat Midden Analysis, since late Pleist.
– Sonoran Desert History (veg & climate)
2. Alluvial Stratigraphy, since early Holocene
– Dry-wet and/or warm-cool periods
3. Dendrochronology, since 300- 400 ybp
– Precipitation
– Temperature
Paleo –Vegetation and –Climate of SW
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At our starting point, 20,000 years ago…At our starting point, 20,000 years ago…
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(40,000 years of vegetation data from…(40,000 years of vegetation data from…packrat middens)packrat middens)
1. Packrat middens- past 20,000 years1. Packrat middens- past 20,000 years
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“Sonoran Desert”
22000-11000 ybp, Late Pleistocene
• Vegetation
22,000 11,000 8,000 4,000
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“Sonoran Desert”
22000-11000 ybp, Late Pleistocene
• Climate relative to today:
22,000 11,000 8,000 4,000
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“Sonoran Desert”
11000-8000 ybp, Early Holocene
Vegetation
22,000 11,000 8,000 4,000
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“Sonoran Desert”
11000-8000 ybp, Early Holocene
• Climate
22,000 11,000 8,000 4,000
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Sonoran Desert
8000-4000 ybp, Mid Holocene
• Vegetation
22,000 11,000 8,000 4,000
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Sonoran Desert
8000-4000 ybp, Mid Holocene
• Climate
22,000 11,000 8,000 4,000
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Sonoran Desert
4000 ybp - present, Late Holocene
• Vegetation
22,000 11,000 8,000 4,000 0
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Sonoran Desert
4000 ybp - present, Late Holocene
• Climate
22,000 11,000 8,000 4,000 0
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Packrat Midden Summary
for
Sonoran Desert:
Packrat Midden Summary
for
Sonoran Desert:
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Graphically it looks like this…
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SW VegetationSW Vegetation
And this…And this…
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• Alluvium: (n)
• Alluvial: (adj)
• Stratigraphy: (n)
• Alluvial stratigraphy:
• Recent geology (Pleistocene-Holocene).
2. Alluvial Stratigraphy of the SW: Definitions…
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2. Alluvial Stratigraphy of the SW (Holocene)
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Alluvial Stratigraphy sites…
“Filling in”DEPOSITION
“carving out”EROSION
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Replication
Why are sediment sites so common in SW?
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• It’s like a jig-saw puzzle
• Distinct layers– Color– Texture– Fossils
• Separated by time– Erosion– Soil
In The Field
Layers C-14 dated
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Alluvial History: Climatic Interpretation
Summary
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3. Dendrochronology (past 300 – 400 years)
• Dendroclimatology
• Subdiscipline of dendrochronology
– Reconstruct past climate
– Heavily replicated
• Within sites
• Within regions
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Dendrochronology recap…
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We’ve Seen This Before
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Summary Paleoenvironments of SW