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NECTIC CHERT, A VERY PECULIAR TYPE OF SILICEOUS ROCK
Zhu Sizhao 1 Hiromi Nagai 2 Masao Kametaka 3 Wu Chunyin 1(1 Department of Earth Sciences;Nanjing University;Nanjing 210093 2 Dating and Materials Research Center;Nagoya university;Nagoya 464-8602;Japan 3 department of Earth and Planetary Sc
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