【摘 要】
：
The Early Cretaceous Jehol Biota,renowned for its exceptionally well-preserved volcanic-influenced ecosys-tem,was buried in lacustrine and occasionally fluvialsediments.This includes,notably,the Huajiying,Yixian and Jiufotang Formations in north-ern Hebei
【机 构】
：
State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of
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The Early Cretaceous Jehol Biota,renowned for its exceptionally well-preserved volcanic-influenced ecosys-tem,was buried in lacustrine and occasionally fluvialsediments.This includes,notably,the Huajiying,Yixian and Jiufotang Formations in north-ern Hebei and western Liaoning and equivalent ash-interbedding sediments in neighboring areas [1-3] (Fig.Ⅰ).It harbors many evolutionarily significant taxonomies,e.g.feathered dinosaurs,early birds,mammalsand flowering plants,representing one of the most diversified terrestrial biotas of the Mesozoic [1,2,4].
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