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59:"SHRIMP ages of detrital zircons from the Changcheng System in the Ming Tombs area, Beijing: Constraints on the protolith nature and maximum depositional age of the Mesoproterozoic cover of the North China Craton"
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Wan, Yusheng; Zhang, Qiaoda; Song, Tianrui (1 November 2003).
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geological formation which has yielded primitive fossil
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