Paleoclimate Reconstructions of Three Mid-Atlantic Miocene Sites
description
Transcript of Paleoclimate Reconstructions of Three Mid-Atlantic Miocene Sites
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Paleoclimate Reconstructions of Three Mid-Atlantic Miocene Sites
Aly BaumgartnerEast Tennessee State University
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PurposeBroaden understanding of Neogene E. North
America
Compare/contribute to global knowledge of Neogene climate
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http://cpgeosystems.com/nam.html
Miocene North America
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Mid-Atlantic Sites
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Legler LigniteMiddle Miocene (~11 mya)Cohansey FormationExotic taxa: Cyathea, Podocarpus, Engelhardia,
Pterocarya
Quercus, Pinus, Carya => climate was warmer, wetter
(Rachele, 1976; Greller and Rachele, 1984)
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Bryn MawrMiddle/Late MioceneBryn Mawr FormationExotic taxa: Sciadopitys, Engelhardia, Pterocarya
Quercus, Alnus, Carya, Taxodium, Liquidambar, Juglans, Pinus.
Quercus, Carya, Engelhardia, Symplocos, Cyrilla => warm-temperate/subtropical w/o extended cool periods
(Pazzaglia, Robinson and Traverse, 1997)
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BrandywineLate Miocene (~11.2-6.5 mya )Exotic taxa: Alangium, Pterocarya, Zelkova, Trapa
Pinus, Smilax, Myrica and Comptonia => temperate climate (McCartan et al.,1990)
Taxodium, Pterocarya, Liquidambar, Cyrilla => warm-temperate or sub-tropical climate (Groot, 1991)
Taxodium distichum/absence of drought-tolerant taxa => high water table and adequate rainfall
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Abies, Tsuga, Myrica, Sequoia, Symplocos,
Sciadopitys
Planera, Clethra, Cyrilla, Cyathea, Fraxinus, Gordonia,
Podocarpus, Plantago
Prunus, Vitis,Taxodium,Gleditsia, Potamogeton, Ptelea, Smilax, Trapa, Sophora,Toxicodendron, Cornus, Hamamelis, Euonymus, Larix Parthenocissus, Nuphar, Liriodendron, Platanus
Populus
Engelhardia, Castanea, Picea, Tilia
Brandywine(Late Miocene)
Legler Lignite(Late Miocene)
Bryn Mawr(Mid/Late Miocene)
Alangium, Acer, Betula, Zelkova
Ulmus, Nyssa, Salix, Pterocarya, Ilex, Quercus, Carya, PinusLiquidambar, Typha, Alnus, Fagus
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MethodsNearest Living Relative Approach• MAT, CMMT, WMMT, MAP, MMaP, MMiP, WMMP• Range of values
• Map with modern intervals• Median value
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ResultsMean Annual Temperature Mean Annual Precipitation
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ResultsCold Month Mean
Temperature Warm Month Mean Temperature
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ResultsMean Maximum Precipitation Mean Minimum Precipitation
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ResultsWarm Month Mean Precipitation
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ResultsMAT CMMT WMMT MAP MMaP MMiP WMMP
Bryn Mawr 13.8-20.8 3.1-13.3 23.7-27.9 823-1613 204-245 9-59 79-180
Brandywine
13.3-16.1 -0.1-7.8 23-25.6 735-1551 109-195 32-56 74-176
Legler Lignite 14.4-20.8 5.2-12.6 24-27.9 996-1347 204-293 52-56 99-142
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ConclusionsAll 3 sites differ from today• MAP exception
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ConclusionsAll 3 sites differ from today• MAP exception
• Legler Lignite most different
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ConclusionsAll 3 sites differ from today• MAP exception
• Legler Lignite most different
• Brandywine least different
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AcknowledgementsMy advisor and committee
Dr. Chris Liu, Dr. Catherine Chen, Dr. Istvan Karsai
The Biology and Geoscience Departments
Financial Support from the National Science Foundation grant to Dr. Liu.