The flourishing of the Jehol Biota is related to the unique, warm, fresh water and continental environment of East Asia in the Early Cretaceous.

热 河生物群的繁盛和东亚地区当时特有的温暖的淡 水和陆地 环境具有密切的联系。

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The study of the Jehol Biota has a long way to go, while the scientific administration and protection of the fossil sites remains a pressing issue.

热河生物群的研究还具有很大的潜力，而对化石的科学发掘和保护的任务还十分艰巨。

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Excavation and trace element analysis indicates: Jehol biota experienced mass mortality and rapid burial; toxic gases of the volcanic activities are the main factors of biological catastrophic event.

化石发掘和微量元素分析表明，热河生物群经历了集群死亡和快速掩埋，火山活动的有毒气体是生物灾难事件的主要因素。

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