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Pinus matthewsii : ウィキペディア英語版 | Pinus matthewsii
''Pinus matthewsii'' is an extinct species of conifer in the Pine family. The species is solely known from the Pliocene sediments exposed at Ch’ijee’s Bluff on the Porcupine River near Old Crow, Yukon, Canada. ==Type locality== ''Pinus matthewsii'' was described from the three ovulate cone specimens all found at the Ch’ijee’s Bluff locality, number HH228. This locality is in the Bluefish Basin and considered part of one of the most complete records of the Pliocene and Early Pleistocene in northwestern North America.〔 The Bluefish and neighboring Old Crow basins were part of the unglaciated Beringian refugium of North America, which harbored the ancestors of the modern pine subsection Contortae. The subsection is though to have radiated out from the refugium into the species ''P. contorta'' and ''P. banksiana''. All the cones were preserved in the basal "unit 1" section of the Ch’ijee’s Bluff outcrop. Unit 1 is composed of sands, gravels and clays, thought to have been forest floor which was rapidly covered by alluvial sediments.〔
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