reproductive structures such as flowers fruits or seeds. Pigg, Manchester, and Wehr (2003) noted in during the description of Corylus johnsonii and Carpinus perryae that they were the oldest confirmed hazelnut and hornbeam fossils. That status was affirmed by Forest et al. (2005) who used both as fossil calibration points for phylogenetic analysis of Betulaceae. Arthropods The insect fauna of the Klondike Mountain Formation includes representatives from over 13 orders, based on a 1992 estimate, including immature though adult specimens and both terrestrial and aquatic taxa. The most prevalent orders are Diptera and Hemiptera, each making up approximately 30% of the fossil insects known in 1992. Blattodea Coleoptera A list of Coleopteran families identified by 1992 included Carabidae, Cerambycidae, Chrysomelidae, Curculionidae, Dytiscidae, Elateridae and Lucanidae, but the beetle fauna has not been described in depth yet, with only two weevil species having been fully described. A third beetle group belonging to the bean beetle tribe Pachymerini has been identified as palm beetles of the Caryobruchus–Speciomerus genus group. Dermaptera The order Dermaptera was first reported in 1992 and is known from a series of isolated partial specimens, mostly abdominal sections with the distinct anal forceps attached. Based on the forceps structuring the specimens were tentatively assigned to the modern family Forficulidae, as the oldest North American representatives of the family known at that time. Diptera Ephemeroptera Lewis (1992) listed one species of Heptageniidae mayflies and three specimens that he did not place to family. The Heptageniidae specimen was later described as a squaregill mayfly by Sinitchenkova (1999) and the oldest member of the genus Neoephemera. Hemiptera Hymenoptera A review of the Okanagan highlands hymenoptera published in 2018 identified four "Symphyta" families in the formation Cimbicidae, Pamphiliidae, Siricidae, and Tenthredinidae. Of the "Apocrita" families thirteen are represented, the "Parasitica" families are Braconidae, Diapriidae Ichneumonidae, Proctotrupidae, and Roproniidae while the Vespoidea families are Formicidae, Pompilidae, Scoliidae and Vespidae. Within Apoidea the "Spheciformes" families include Angarosphecidae and Sphecidae while Halictidae is the sole "Apiformes" family known from body fossils. Prunus and Ulmus leaves have been found having damage that is consistent with the damage pattern left by Megachilidae species bees when they remove sections of tissue for nest lining. There are several additional Apoidea fossils that were left as incertae sedis in the group based on the similarity between them and Paleorhopalosoma menatensis, a Paleocene species described from the Menat Formation Auvergne, France. The