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Flammenmergel : ウィキペディア英語版
Flammenmergel

The Flammenmergel is a lithological unit of the Lower Chalk in Germany.
In Lower Saxony it reaches a depth of 110 to 150 m in the area of the ''Sackmulde'' (a fold in the Germanic Basin).〔Harms, F. J. (1984): Erläuterungen zu Blatt Nr. 4025 Freden. Niedersächsisches Landesamt für Bodenforschung, 168 S., Hannover.〕 The Flammenmergel gets its name from its "flamed" or "burnt" appearance.
According to JORDAN(1968), this appearance is caused by the tracks of burrowing organisms, which consist primarily of siliceous sponge spicules which have been washed into the burrows.〔Jordan, H. (1968): Gliederung und Genese des Flammenmergels (Alb) in Hils- und Sackmulde. Z. dt. Geol. Ges., 117: 391-424, Hannover.〕 The silicic acid, when weathered, forms black streaks, which give the rock its characteristic appearance. Jordan divides the Flammenmergel into five units.〔 The Flammenmergel is a slightly clayey to slightly sandy marl. It is yellow to ochre in colour, whereas the streaky "flames" are dark grey to black. The rock is siliceous and hard.
==Notes==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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