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

Richard M. Dillhoff, Thomas A. Dillhoff, David R. Greenwood, Melanie L. DeVore, Kathleen Pigg

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

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 °C and bioclimatic analysis (BA) calculates a MAT of 12.8 ± 2.5 °C. Coldest month mean temperature (CMMT) was >0 °C. Mean annual precipitation (MAP) was >70 cm/year but is estimated with high uncertainty. Both theCLAMPand BA estimates are at the low end of theMATrange previously published for other Okanagan Highland localities, indicating a temperate climate consistent with a mixed conifer-deciduous forest.

Original languageEnglish (US)
Pages (from-to)514-529
Number of pages16
JournalBotany
Volume91
Issue number8
DOIs
StatePublished - Aug 6 2013

Keywords

  • Eocene
  • Leaf morphotype
  • Okanagan highlands
  • Paleoclimate reconstruction
  • Paleoenvironment
  • Palynology

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science

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    Dillhoff, R. M., Dillhoff, T. A., Greenwood, D. R., DeVore, M. L., & Pigg, K. (2013). The Eocene Thomas Ranch Flora, Allenby Formation, Princeton, British Columbia, Canada. Botany, 91(8), 514-529. https://doi.org/10.1139/cjb-2012-0313