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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 Annona Chalk ： ウィキペディア英語版 Annona Chalk The Annona Chalk is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period. The formation is a hard, thick-bedded to massive, slightly fossiliferous chalk. It weathers white, but is blue-gray when freshly exposed. The unit is commercially mined for cement. Fossils in the Annona Chalk include coelenterates, echinoderms, annelids, bivalves, gastropods, cephalopods, and some vertebrate traces. The beds range in thickness, up to over 100 feet in depth in some areas (such as the White Cliffs). There is a gradual transition between the Annona chalk and the underlying Brownstone formation, where chalk and marl are interbedded. ==See also== * List of fossiliferous stratigraphic units in Arkansas * Paleontology in Arkansas 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「Annona Chalk」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.