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Lehmann, Bernd; Nägler, Thomas; Holland, Heinrich; Wille, Martin; Mao, Jingwen; Pan, Jiayong; Ma, Dongsheng; Dulski, Peter (2007). Highly metalliferous carbonaceous shale and Early Cambrian seawater. Geology, 35(5), pp. 403-406. Boulder, Colo.: Geological Society of America 10.1130/G23543A.1