The Eocene Thomas Ranch flora, Allenby Formation, Princeton, British Columbia, Canada

被引:28
作者
Dillhoff, Richard M. [1 ]
Dillhoff, Thomas A. [1 ]
Greenwood, David R. [2 ]
DeVore, Melanie L. [3 ]
Pigg, Kathleen B. [4 ]
机构
[1] Evolving Earth Fdn, Issaquah, WA 98027 USA
[2] Brandon Univ, Dept Biol, Brandon, MB R7A 6A9, Canada
[3] Georgia Coll & State Univ, Dept Biol & Environm Sci, Milledgeville, GA 31061 USA
[4] Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
基金
加拿大自然科学与工程研究理事会;
关键词
Eocene; leaf morphotype; Okanagan Highlands; paleoclimate reconstruction; paleoenvironment; palynology; CHERT MIDDLE EOCENE; NORTHEASTERN WASHINGTON-STATE; OKANAGAN HIGHLANDS; SP-NOV; PERMINERALIZED FRUITS; PALEOROSA-SIMILKAMEENENSIS; VEGETATIVE GROWTH; LATE PALEOCENE; NORTH-AMERICA; POLLEN;
D O I
10.1139/cjb-2012-0313
中图分类号
Q94 [植物学];
学科分类号
071001 [植物学];
摘要
A flora from Thomas Ranch near Princeton, British Columbia, Canada, is assessed for biodiversity and paleoclimate. This latest Early to early Middle Eocene flora occurs in the Allenby Formation. Seventy-six megafossil morphotypes have been recognized, representing at least 62 species, with 29 identified to genus or species. Common taxa include Ginkgo L., Metasequoia Miki, Sequoia Endl., Abies Mill., Pinus L., Pseudolarix Gordon, Acer L., Alnus Mill., Betula L., Fagus L., Sassafras J Presl, Macginitiea Wolfe & Wehr, Prunus L., and Ulmus L. More than 70 pollen and spore types are recognized, 32 of which are assignable to family or genus. The microflora is dominated by conifers (85%-97% abundance), with Betulaceae accounting for most of the angiosperms. The Climate Leaf Analysis Multivariate Program (CLAMP) calculates a mean annual temperature (MAT) of 9.0 +/- 1.7 degrees C and bioclimatic analysis (BA) calculates a MAT of 12.8 +/- 2.5 degrees C. Coldest month mean temperature (CMMT) was >0 degrees C. Mean annual precipitation (MAP) was >70 cm/year but is estimated with high uncertainty. Both the CLAMP and BA estimates are at the low end of the MAT range previously published for other Okanagan Highland localities, indicating a temperate climate consistent with a mixed conifer-deciduous forest.
引用
收藏
页码:514 / 529
页数:16
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