云南大学丛培允团队揭示了早寒武世澄江生物群中一个被忽视的埋藏学窗口，2024年7月12日，国际知名学术期刊《地质学》发表了这一成果。

研究人员介绍，来自中国西南部澄江生物群的保存异常完好的软体动物化石，对了解寒武纪动物大爆发生物多样性和生态学至关重要。几乎所有以往报道的澄江软体化石几乎都来自于玉案山组事件泥岩层(EB)。

基于过去十年化石的采集，研究人员首次对互层背景泥岩层(BGB)的软体化石进行了全面的研究，并描述了它们的保存特征。柔软的内部细胞器官/组织，如消化道和腺体、心血管系统、神经系统和肌肉组织，主要以碳质印模的形式被保存下来，这与它们在EB中富含氧化铁的保存相反。

研究结果强调了单一的伯吉斯页岩中两种不同的保存模式，可能受控于腐烂、干酪根化和黄铁矿化的复杂相互作用。

附：英文原文

Title: Unveiling an ignored taphonomic window in the early Cambrian Chengjiang Biota

Author: Xiangtong Lei, Peiyun Cong, Shangnan Zhang, Fan Wei, Ross P. Anderson

Issue&Volume: 2024-07-12

Abstract: The exceptionally preserved soft-bodied fossils from the Chengjiang Biota of southwest China have proved to be critical for our understanding of the biodiversity and ecology of the Cambrian explosion of animals. Almost all previously reported soft-bodied Chengjiang fossils are from the event mudstone beds (EB) of the Yu’anshan Formation. Here, we present the first comprehensive investigation of the soft-bodied fossils from the interbedded background mudstone beds (BGB), based on collections made across the past decade, and characterize their preservation. Soft internal cellular organs/tissues, such as digestive tracts and glands, cardiovascular systems, nervous systems, and musculature, are predominantly preserved as carbonaceous compressions, in contrast to their iron oxiderich preservation in the EB. Our work highlights two distinct preservation modes within a single Burgess Shaletype Lagersttte, possibly due to the complex interplay of decay, kerogenization, and pyritization.

DOI: 10.1130/G52215.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52215.1/645501/Unveiling-an-ignored-taphonomic-window-in-theredirectedFrom=fulltext