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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 Geology of Delaware ： ウィキペディア英語版 Geology of Delaware The geology of Delaware consists of two physiographic provinces. They are the Atlantic Coastal Plain Province and the Piedmont Province. ==Coastal plain== The coastal plain in Delaware is by far the largest province, encompassing all of the state south of the Kirkwood Highway from Newark to Wilmington.〔Plank, M.O., and Schenck, W.S.,(1998). Delaware Piedmont Geology Including a guide to the rocks of Red Clay Valley: Delaware Geologic Survey SP-20, p 17〕 The unconsolidated sediments of the coastal plain range in age from Cretaceous to recent. They consist of gravels, sands, silt, and clay, with varying mixtures of all four. The oldest layer, the Potomac Formation also contains some scattered lignite. As recently as five million years ago, much of present-day Delaware was submerged as the floor of a shallow sea, the Salisbury Embayment; only with the retreat of global sea levels in recent geologic times did the coastal plain areas of the state emerge as dry land. 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「Geology of Delaware」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.