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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 Page-Ladson prehistory site ： ウィキペディア英語版 Page-Ladson prehistory site The Page-Ladson prehistory site (8JE591) is a deep hole in the bed of the Aucilla River (between Jefferson and Taylor Counties in the Big Bend region of Florida) that has stratified deposits of late Pleistocene and early Holocene animal bones and human artifacts. A group of eleven artifacts have an average age of 15,405 to 14,146 calendar years Before Present (12,425 ± 32 14C years BP). The earliest dates for artifacts recovered from the site are between 1,000 and 1,500 years before the advent of the Clovis culture.〔Dunbar: 414〕 ==Prehistoric environment== At the height of the last ice age (the Wisconsin glaciation), the sea level was up to 100 meters lower than at present. Most of Florida is a thick limestone platform, with typical Karst topography. As limestone is porous, salt water penetrates the lower part of the Florida platform, and fresh water floats on top of the salt water. With the lowered sea level of the ice age, the fresh water table in Florida was also lowered, leaving most of Florida much drier than it is at present. The only reliable sources of fresh water at elevations that are currently above sea level were sinkholes and the deeper parts of river beds. The Page-Ladson site was one of those watering holes, located in a ravine that is now the bed of the river.〔Brown:13-14〕〔Milanich:38-40〕 The lower part of the Aucilla River (from the Cody Scarp to the Gulf of Mexico) crosses the Woodville Karst Plain, which consists of a thin layer of sand over limestone bedrock. Much of the flow of the Aucilla River has been captured by an underground drainage system created by karst processes. Sections of the river are entirely underground, surfacing for short stretches and then disappearing again. The Page-Ladson site is located in one of the above ground sections, known as Half-Mile Run (although it is closer to one mile long). Other sites on the Aucilla River are also yielding paleontological and archaeological finds, all as part of a long-running Aucilla River Prehistory Project.〔Brown:13-14〕 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「Page-Ladson prehistory site」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.