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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 Yarravia ： ウィキペディア英語版 Yarravia ''Yarravia'' is a genus of extinct vascular plants mainly known from fossils found in Victoria, Australia.〔 Originally the rocks in which they were found were considered to be late Silurian in age; more recently they have been found to be Early Devonian (Pragian, around ).〔 Specimens consist only of incomplete leafless stems, some of which bore groups of spore-forming organs or sporangia which were fused, at least at the base.〔 ==Source of fossils== Fossils of ''Yarravia'' were found at a location called the 'Yarra Track', near to the town of Wood's Point, Victoria, Australia.〔 The shale in which they were found, now called the Wilson Creek Shale, was for many years regarded as of late Silurian age. The dating was based on graptolite fossils which were identified as ''Monograptus uncinatus'', which is of early Ludlow age (around ). These were subsequently described as a new species, ''M. thomasi'', which proved to be of Early Devonian age (Pragian, around ). Rocks of Silurian age do occur in the region and the fossil plant ''Baragwanathia'' has been found from both late Silurian and the Early Devonian strata. However, ''Yarravia'' was found only in the Devonian shales.〔 Fossils collected near Rebreuve, Pas-de-Calais Department, northern France, were named ''Yarravia minor'' by Danzé-Corsin in 1956. The strata in which they were found were initially considered Pragian, but are now thought to be Emsian (from around ). 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「Yarravia」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.