Silicalite of the Upper Permian Dalong Formation in Pingtang, south Guizhou has a stable horizon with a thickness of tens meters, yielding abundant ammonites and Brachiopoda.

  • 黔南平塘晚二叠世大隆组的层状硅质岩分布稳定,厚度一般为几十米,富含数量不等的菊石和腕足化石。

  • 互联网摘选 2025-01-20 00:06:09

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