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Red Crag Formation : ウィキペディア英語版 | Red Crag Formation The Red Crag Formation is a series of marine deposits at the base of the Pleistocene in Suffolk and Essex. This material rests on an erosion surface of Cretaceous to Palaeogene rocks. It is a shore deposit, medium to coarse-grained and locally shelly. The most extensive exposure of Red Crag is found at Bawdsey Cliff, the site of which is designated a Site of Special Scientific Interest.〔(Bawdsey Cliff ), SSSI citation, Natural England. Retrieved 2013-01-25.〕 Around of Crag from the Gelasian are exposed.〔 Red Crag deposits have been dated from Piacenzian age at Walton-on-the-Naze to Preludhamian age at Sizewell on the basis of microfossils. Crag is a local word for a shelly sand. The Red Crag is generally stained red by ferruginous compounds. ==References==
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「Red Crag Formation」の詳細全文を読む
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