page_title: Klondike Mountain Formation
section_title: Insects and crustaceans
hierarchical_section_title: Klondike Mountain Formation / Paleobiota / Insects and crustaceans
caption_attribution_description: English: Holotype wing of the extinct Cimbrophlebia brooksi. Photographed after description. 49.5 Million Years old; "Boot Hill", Klondike Mountain Formation, Republic, Washington, USA. Stonerose Interpretive Center Collection # SR 06-20-05 A.
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: The neuropteran insects (lacewings and their allies) identified as of 2014 include species from the families Berothidae, Chrysopidae, Hemerobiidae, Ithonidae (including Polystoechotidae), Nymphidae, Osmylidae, and Psychopsidae.  A number of mecopteran species belonging to the families Cimbrophlebiidae, Dinopanorpidae, Eorpidae, and Panorpidae are also known.  A solitary lepidopteran fossil has been recovered, but no full descriptive work has been made on the specimen, aside from a single PhD dissertation.  Early examination placed the moth in the family Geometridae, but later work has identified it as the oldest member of the tiger moth subfamily Arctiinae.
caption: Cimbrophlebia brooksi
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