page_title: Klondike Mountain Formation
section_title: Flowering plants
hierarchical_section_title: Klondike Mountain Formation / Paleobiota / Flowering plants
caption_attribution_description: English: An incomplete, approximately 6&#160;cm (2.4&#160;in) long, Pentacentron sternhartae Infructescence. Holotype specimen. Ypresian, Latest Early Eocene; Tom Thumb Tuff member, Klondike Mountain Formation, Republic, Washington, U.S.A. Stonerose Interpretive Center, Republic, Ferry County, Washington, U.S.A. Collection number SR 93-08-02
context_page_description: The Klondike Mountain Formation is an Early Eocene geological formation located in the northeast central area of Washington state. The formation, named for the type location designated in 1962, Klondike Mountain north of Republic, Washington, is composed of volcanic rocks in the upper unit and volcanics plus lacustrine sedimentation in which a lagerstätte with exceptionally well-preserved plant and insect fossils has been found, along with fossil epithermal hot springs.
  The formation is the youngest in a group of formations which belong to the Challis Sequence rocks. The formation unconformably overlies rocks of the Eocene Sanpoil Volcanics and much older Triassic and Permian formations. The formation is bounded on its edges by a series of high-angle strike slip faults, which have contained the Klondike Mountain Formation in a series of graben structures, such as the Republic Graben.
context_section_description: Over a dozen different Rosaceae genera, both extant and extinct, have been identified in the formation.  These fossils are some of the oldest reliable macrofossils (excluding ancient fossil pollen) for the family.  Fossils of Sorbus genus and Rhus genus leaves that show evidence of being interspecies hybrids have been noted from the formation.  Flynn, DeVore and Pigg in 2019 described four species of sumac which formed multiple hybrids.
caption: Pentacentron sternhartae
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