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Changcheng System
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Wan, Yusheng; Zhang, Qiaoda; Song, Tianrui (1 November 2003). "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". Chinese Science Bulletin. 48 (22): 2500–2506. doi:10.1360/03wd0005. S2CID 126957929. <a href="https://link.springer.com/article/10.1360/03wd0005" target="_blank">https://link.springer.com/article/10.1360/03wd0005</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>