Permian manganese nodules near Dillon, Montana
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https://b2find.eudat.eu/dataset/0aaec45b-6493-5534-9dba-950c9f89a427
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Concentrically ringed manganese nodules, similar in form to many found on modern ocean and sea floors, occur in a very fine grained argillaceous sandstone bed of the Permian...
同心环纹锰结核（Concentrically ringed manganese nodules）与现代洋底及海底产出的多数锰结核形态相似，赋存于二叠纪的一套极细粒泥质砂岩岩层中……
