Title: PALYNOLOGY
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2HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT
- PALYNOLOGY
- Environmental Sequence
- Global Climate Change
- Tectonism
- Sierran Rain Shadow
- Local Uplift/Subsidence
- VOLCANOLOGY
- SRP History
- Plume Crust Interactions
- Hotspot Dynamics
3HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT
- PALYNOLOGY
- Environmental Sequence
- Global Climate Change
- Tectonism
- Sierran Rain Shadow
- Local Uplift/Subsidence
Dated Tephra Dated Flows Uplift/Subsidence
- VOLCANOLOGY
- SRP History
- Plume Crust Interactions
- Hotspot Dynamics
4HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT
- PALYNOLOGY
- Environmental Sequence
- Global Climate Change
- Tectonism
- Sierran Rain Shadow
- Local Uplift/Subsidence
Dated Tephra Dated Flows Uplift/Subsidence
Paleoelevation Interbed Ages Correlation
- VOLCANOLOGY
- SRP History
- Plume Crust Interactions
- Hotspot Dynamics
5Strong influence of elevation on vegetation
palynology
6Climatic changes (glacial/interglacial) subtle
7Marked late-Neogene evolution of
vegetation Climate global tectonic
4200 ft
8Trends late Miocene early Pleistocene (means
of dating and correlating flows)
0.7 m.a.
5 m.a.
10 m.a.
9Composite of Bruneau and MHAB-1 cores
4000 ft
10Tentative Chronology (based on correlation)
Pleisto
Pliocene
Terteling Spr 5-6 m.a.
Mio
Dated Lava
11Volcanic Tephra Chronology for palynology,
Before Lake Idaho
8 Ma
11 Ma
12Interbedded Sediments east of Lake Idaho
younger than Lake Idaho
4 Ma
6.25 Ma
13Interbedded Sediments cores wells INEL
(thanks to Linda Davis) Deerflat, Simplot, etc.
1.12 3.16 km 8.2 Ma
14Tentative Sequence
15Preliminary Palynological Results
- Tentative vegetation-climate sequence
- Potential value of long cores
- Apparent ages consistent with HOTSPOT
- Paleoelevation large changes
- INEL-1 km
- Interbedded sediments provide
- Wider coverage (not just Lake Idaho)
- Tephra flow dates for Palynology sequence
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17Horseshoe Bend
18Additional INEL, Hagerman Fossil Beds and
Simplot Well samples
19Age Nothing in Lk Idaho older than
mid-Miocene?Elevation big changes high elev.
flora very different
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21Sand Spr. 0.095 Ma
22Snake River Plain Cross-section Homedale - Boise
23Surface elevation of Lake Idaho sensu lato
Bruneau Fm.
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27Miocene Riparian Vegetation
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