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... violent crustal movement during the Triassic period, and there were especially many basalts. And basalt is notoriously easy to form abnormal magnetic fields.
Similar to Death Valley in Kunlun Mountains, there is also Heizhugou in Sichuan Province, where there is also a 60-kilometer-long geomagnetic anomaly belt in the Suoyda Canyon. Before opening Death Valley in the early years, the higher authorities also sent a scientific expedition team to conduct field surveys in Heizhugou.
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