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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 Hexagonaria ： ウィキペディア英語版 Hexagonaria ''Hexagonaria'' is a genus of colonial rugose coral. Fossils are found in rock formations dating to the Devonian period, about 350 million years ago. Specimens of ''Hexagonaria'' can be found in most of the rock formations of the Traverse Group in Michigan. Fossils of this genus form Petoskey stones, the state stone of Michigan. ''Hexagonaria'' is a common constituent of the coral reefs exposed in Devonian Fossil Gorge below the Coralville Lake spillway〔Jean Prior, (Devonian Fossil Gorge ), Iowa Geological Survey, 1998.〕 and in many exposures of the Coralville Formation in the vicinity of Coralville, Iowa.〔Brian J. Witzke and Bill J. Bunker, Sedimentation and stratigraphic architecture of a Middle Devonian (late Givetian) transgressive-regressive carbonate-evaporite cycle, Coralville Formation, Iowa area, (Paleozoic Sequence Stratigraphy, Biostratrigraphy and Biogeology, Special Paper 321 ), Geological Society of America, 1997.〕 == Species Identification == Based on Erwin C. Strumm's ''Corals of the Transverse Group of Michigan Part 13, Hexagonaria'', published in 1970.〔 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「Hexagonaria」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.