Paleoclimatic And Paleoecological Implications Of A Paleocene-eocene Fossil Leaf Assemblage, Chickaloon Formation, Alaska

Title:
Paleoclimatic And Paleoecological Implications Of A Paleocene-eocene Fossil Leaf Assemblage, Chickaloon Formation, Alaska
Authors:
Sunderlin, David; Loope, Garrison; Parker, Nancy E.; Williams, Christopher J.
Abstract:
New collections of a leaf compression-impression paleoflora preserved in fluvio-lacustrine sediments of the upper Chickaloon Formation, south-central Alaska, United States, provide leaf physiognomic climate estimates for the early Eocene in southern Alaska and rare data on plant-insect interactions from a subarctic setting. Thirty-nine broadleaf angiosperm morphotypes occur in a parautochthonous assemblage along with Metasequoia shoots and trunks, compressions of a diverse suite of seeds, monocotyledonous aquatic plants, freshwater gastropods, and inclusion-bearing dispersed amber. Leaf-character derived mean annual temperature estimates (11-14.6 degrees C) are significantly warmer than Alaska at present and indicate warm temperate conditions at the time of deposition. Leaf-derived mean annual precipitation estimates of similar to 110-160 cm/annum are comparable to those from similar-age paleofloras in Arctic Canada and indicate wetter conditions than nearly coeval paleofloras further south in the North American mid-latitudes. Leaf herbivory is rare in the Chickaloon assemblage (similar to 9% of leaf fragments) as compared to other, lower latitude Eocene assemblages, but exhibits four of the main leaf-damage guilds (hole feeding, margin feeding, surface feeding, and skeletonization). These data provide a rare glimpse at a high-latitude terrestrial forested ecosystem during a global hothouse climate phase and thus have implications in understanding how biogeographic patterning and ecological systems respond to non-analog, warm high-latitude environmental conditions.
Citation:
Sunderlin, David, Garrison Loope, Nancy E. Parker, and Christopher J. Williams. 2011. "Paleoclimatic And Paleoecological Implications Of A Paleocene-eocene Fossil Leaf Assemblage, Chickaloon Formation, Alaska." Palaios 26(5-6): 335-345.
Publisher:
Society for Sedimentary Geology
DATE ISSUED:
2011-05
Department:
Geology
Type:
article
PUBLISHED VERSION:
10.2110/palo.2010.p10-077r
PERMANENT LINK:
http://hdl.handle.net/11282/310060

Full metadata record

DC FieldValue Language
dc.contributor.authorSunderlin, Daviden_US
dc.contributor.authorLoope, Garrisonen_US
dc.contributor.authorParker, Nancy E.en_US
dc.contributor.authorWilliams, Christopher J.en_US
dc.date.accessioned2013-12-23T16:24:22Z-
dc.date.available2013-12-23T16:24:22Z-
dc.date.issued2011-05en
dc.identifier.citationSunderlin, David, Garrison Loope, Nancy E. Parker, and Christopher J. Williams. 2011. "Paleoclimatic And Paleoecological Implications Of A Paleocene-eocene Fossil Leaf Assemblage, Chickaloon Formation, Alaska." Palaios 26(5-6): 335-345.en_US
dc.identifier.issn0883-1351en_US
dc.identifier.urihttp://hdl.handle.net/11282/310060-
dc.description.abstractNew collections of a leaf compression-impression paleoflora preserved in fluvio-lacustrine sediments of the upper Chickaloon Formation, south-central Alaska, United States, provide leaf physiognomic climate estimates for the early Eocene in southern Alaska and rare data on plant-insect interactions from a subarctic setting. Thirty-nine broadleaf angiosperm morphotypes occur in a parautochthonous assemblage along with Metasequoia shoots and trunks, compressions of a diverse suite of seeds, monocotyledonous aquatic plants, freshwater gastropods, and inclusion-bearing dispersed amber. Leaf-character derived mean annual temperature estimates (11-14.6 degrees C) are significantly warmer than Alaska at present and indicate warm temperate conditions at the time of deposition. Leaf-derived mean annual precipitation estimates of similar to 110-160 cm/annum are comparable to those from similar-age paleofloras in Arctic Canada and indicate wetter conditions than nearly coeval paleofloras further south in the North American mid-latitudes. Leaf herbivory is rare in the Chickaloon assemblage (similar to 9% of leaf fragments) as compared to other, lower latitude Eocene assemblages, but exhibits four of the main leaf-damage guilds (hole feeding, margin feeding, surface feeding, and skeletonization). These data provide a rare glimpse at a high-latitude terrestrial forested ecosystem during a global hothouse climate phase and thus have implications in understanding how biogeographic patterning and ecological systems respond to non-analog, warm high-latitude environmental conditions.en_US
dc.publisherSociety for Sedimentary Geologyen_US
dc.identifier.doi10.2110/palo.2010.p10-077r-
dc.subject.departmentGeologyen_US
dc.titlePaleoclimatic And Paleoecological Implications Of A Paleocene-eocene Fossil Leaf Assemblage, Chickaloon Formation, Alaskaen_US
dc.typearticleen_US
dc.identifier.journalPalaiosen_US
dc.identifier.volume26en_US
dc.identifier.issue56en_US
dc.identifier.startpage335en_US
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