Dear Volker and List, The only two potential impact craters under investigation in China mainland are in Qinghai Provence; Xining City and Qinghai Lake. A paper was presented at the IEJSAP conference at Yamaguchi University, Japan in 2003. Principle investigators in China are Li, Juambao and Fugu Xiasong Hu, et.al. In Taiwan I investigated Chia Ming Hu proposed impact crater (negative findings); also presented at IEJSAP. Dr. Chen of Taiwan was the Taiwanese original investigator. Sorry no information on Yanshan. Sincerely, Dirk Ross....Tokyo
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