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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 Ginkgo cranei ： ウィキペディア英語版 Ginkgo cranei ''Ginkgo cranei'' is an extinct ''Ginkgo'' species in the family Ginkgoaceae described from a series of isolated fossil ovulate organs and leaves. The species is known from upper Paleocene sediments exposed in the state of North Dakota, USA. It is the first ''Ginkgo'' species to be described from Paleogene period with reproductive structures. ==History and classification== ''Ginkgo cranei'' is represented by a group of fossil specimens from the Upper Paleocene aged Sentinel Butte Formation exposed near the town of Almont, North Dakota. The specimens are preserved in a fine-grained yellow- to brown-colored shale with a notably high iron content. Fossils found in the shales are often three-dimensionally preserved with stem and seed structure intact. The age of the formation is based on the recovery of late Tiffanian mammals in the upper section of the formation along with the floral and palynological assemblages of the formation. Many of the ''G. cranei'' seeds are preserved as casts with hollow crystalline interiors and exterior cuticle present. Associated with the ovulate organs are fossil leaves that were formerly assigned to the form genus ''Ginkgo adiantoides''.〔 The type specimens for ''G. cranei'' include two ovulate organ fossils, a holotype and a paratype. The holotype is numbered number UWSP42706 which, along with four other specimens, is currently preserved in the paleobotanical collections of University of Wisconsin–Stevens Point in Stevens Point, Wisconsin.〔 The paratype, number PP34187, along with one additional specimen, are part of the geology collections maintained at the Field Museum of Natural History in Chicago, Illinois. A total of only seven ''G. cranei'' ovulate organ fossils were known at the time of the species description.〔 The specimens were studied by paleobotanist Zhiyan Zhou of Nanjing University, Cheng Quan of Jilin University and Yu-Sheng (Christopher) Liu of East Tennessee State University. Zhou and associates published their 2012 type description for ''G. cranei'' in the ''International Journal of Plant Sciences''. The chosen specific name ''cranei'' was in honor of Sir Peter Crane who, with Steven Manchester and David Dilcher, first discovered the Almont ''Ginkgo'' fossils.〔 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「Ginkgo cranei」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.