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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Tilia johnsoni ： ウィキペディア英語版 Tilia johnsoni ''Tilia johnsoni'' is an extinct species of flowering plant in the family Malvaceae that, as a member of the genus ''Tilia'', is related to modern lindens (called "limes" in Britain and "basswoods" in the US). The species is known from fossil leaves found in the early Eocene deposits of northern Washington State, United States and a similar aged formation in British Columbia, Canada. ==History and classification== ''Tilia johnsoni'' leaf fossils have been identified from two locations in Western North America, the 49 million year old Klondike Mountain Formation near Republic, Washington and at the Quilchena locality near Merritt, British Columbia. Fossil pollen identified as from the genus ''Tilia'' has been identified from a greater range of Okanagan Highland fossil sites, having been found in the Allenby Formation near Princeton, British Columbia, at the Falkland fossil site near Falkland, the McAbee Fossil Beds near Kamloops, the Hat Creek Amber and Driftwood Canyon Provincial Park near Smithers. Of the Okanagan Highlands sites, ''Tilia'' microfossils and macrofossils have not been identified from the Horsefly fossil beds near the unincorporated community of Horsefly.〔 The age for the Okanagan Highland locations is, in general, Early Eocene, with the sites that have current uranium-lead or argon–argon radiometric dates being of Ypresian age, while the undated sites or those given older dates being possibly slightly younger and Lutetian in age.〔 ''Tilia johnsoni'' was described from a single type specimen, a leaf, the holotype being UW 39712, in the paleobotanical collections of Burke Museum, and its counterpart UCMP 9291 in the University of California Museum of Paleontology in California. Working from this specimen, collected in the Republic, Washington area in the early 1980s, the fossil was studied by Jack A. Wolfe of the University of California and Wesley C. Wehr of the Burke Museum.〔 They published their 1987 type description for the species in a United States Geological Survey monograph on the North Eastern Washington dicot fossils. The specific epithet ''johnsoni'' is a patronym recognizing the help provided to Wolfe and Wehr by a young Kirk Johnson, now director of the Smithsonian's National Museum of Natural History. Wolfe and Wehr noted that, at the time of publication, ''T. johnsoni'' was the oldest macrofossil occurrence for the genus to be described,; older microfossil records of pollen date near to the Paleocene – Eocene boundary, and fruits of an extinct ''Tilia'' relative are known from the Eocene of England.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tilia johnsoni」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.