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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 Kirtland Formation ： ウィキペディア英語版 Kirtland Formation The Kirtland Formation (originally the Kirtland Shale) is a sedimentary geological formation.〔Sullivan, R.M., and Lucas, S.G. 2006. "(The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America )." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.〕 It is the product of alluvial muds and overbank sand deposits from the many channels draining the coastal plain that existed on the inland seashore of North America, in the late Cretaceous period. It overlies the Fruitland Formation. It is found in the San Juan Basin in the states of New Mexico and Colorado, in the United States of America. The base of the Kirtland Formation and its lowest sub-unit, the Hunter Wash member, has been dated to 74.55 ± 0.29 Ma. Together with the upper part of the underlying Fruitland Formation, this contains fossils representing the Hunter Wash local fauna. The border between the Hunter Wash member and overlying Farmington member dates to approximately 74 million years ago. The top of the Farmington member and bottom of the overlying De-na-zin member has been radiometrically dated to 73.37 ± 0.28 Ma ago. The top of the De-na-zin member, which contains the Willow Wash local fauna, has been dated to 73.04 ± 0.25 Ma ago.〔 Overlying the De-na-zin member is a unit called the Naashoibito member This has often been considered to be part of the Kirtland formation, but more recently has been transferred back to the overlying Ojo Alamo Formation, which it had originally been part of.〔 ==Vertebrate Paleofauna== 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「Kirtland Formation」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.