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Patuxent Formation : ウィキペディア英語版 | Patuxent Formation
The Patuxent Formation is a Cretaceous geologic formation of the Atlantic coastal plain. ==Description== The Patuxent formation was first described by W. B. Clark in 1897.〔 The formation is primarily unconsolidated sand and clay. The sand often contains kaolinized feldspar, making it an arkose. Clay lumps are common, and sand beds gradually transition to clay. Sandy beds may be crossbedded, which is evidence of shallow water origin. The Patuxent is the basal unit of the Coastal Plain sedimentary formations and unconformably overlies the crystalline basement rocks. This underlying unconformity is the subsurface equivalent of the Atlantic Seaboard Fall line.
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「Patuxent Formation」の詳細全文を読む
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