The black graptolite shale facies indicate a deep-water, half enclosed and anoxic sedimentary environment.

  • 中奥陶世黑色的笔石页岩为典型的半封闭缺氧的深水沉积环境,反映了海水逐步加深,水体也变得相对宁静.

  • 互联网摘选 2025-01-17 07:12:21

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