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云龟山上这块2亿多年前的化石是重庆海陆变迁的证据
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重庆2亿年前是片海 这里还发现已灭绝的海洋生物化石
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重庆2亿年前是片海 这里还发现已灭绝的海洋生物化石 _ 东方财富网
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重庆发现迄今唯一火山岩观测点 距今2 6亿年
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视频 | 世界地球日科普活动走进华蓥山 寻找2 6亿年前火山岩
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