open marine platform facies 开阔海台地相
Yeyungou Formation mainly developed carbonate slope facies, deep water basin facies and a little carbonate open platform facies.
野云沟组主要为斜坡相和盆地相沉积，少量为碳酸盐台地相沉积。
The Miaohe-type biotas occur in the black shale and siliceous shale in the transitional areas from the late open platform facies to deep-water shelf-bathyal facies.
庙河型生物群的产出位于晚期开阔台地向深水陆棚-次深海过渡相区中的黑色页岩、硅质页岩中，其沉积环境为最大浪基面以下的宁静、贫氧环境，其沉积方式为悬浮沉积。
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