Mass appearance is usually accompanied by mass disappearance, which may be found near many interperiod boundaries or other boundaries of the Phanerozoic where catastrophic events happened.
群集出现常伴随着群集消失，这可见于显生宙许多发生过灾变事件的纪一级或其他级别的地层界限附近。
Mass appearance is usually accompanied by mass disappearance, which may be found near many interperiod boundaries or other boundaries of the Phanerozoic where catastrophic events happened.
群集出现常伴随着群集消失，这可见于显生宙许多发生过灾变事件的纪一级或其他级别的地层界限附近。
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