Exploration of Bianstone
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According to a discovery made by the Chinese geologist, Lou Huajun, certain ancient geological strata boast a high content of the chemical element iridium, which dates back to the later period of the Cretaceous 65 million years ago. Since iridium does not exist on the earth’s surface, it can be inferred that a meteorite had hit the earth in Western Shandong at that time. 5,6,7 And Professor Lou believes that it is in this extremely special environment that Bianstone came into existence.