埃迪卡拉纪—寒武纪之交见证了地球—生命系统不同圈层的重大变革, 是复杂多细胞生物演化的重要转折期。华南是开展相关研究的主要区域之一, 但前人工作主要集中在化石材料丰富的浅水台地相区, 深水区生物组成面貌尚未得到充分认识。本研究对斜坡相区贵州交榜剖面的留茶坡组进行了详细研究, 通过酸蚀和薄片观察发现了丰富的化石材料, 包括: 海绵骨针、软舌螺、可能的原牙形类(? Protohertzina sp.)和织金钉类(? Zhijinites sp.)、球形疑源类、Megathrix longus, 及不同类型的多细胞藻类, 亲缘关系未定的Poratusiramus sp.、球形化石和形态多样的丝状、片状化石等。该化石组合属于寒武纪纽芬兰世幸运期, 其中的骨骼化石以海绵骨针为主。化石组合中既有与浅水区共有分子, 也有深水区特有类群, 丰富了斜坡相区的化石记录, 具有潜在的地层对比和演化意义。

The Ediacaran-Cambrian transition witnessed significant changes in the Earth-life system and was a pivotal time in the evolution of complex multicellular organisms. South China yields essential fossil and stratigraphic records for conducting related research; however, prior investigations have primarily focused on fossil-rich shallow-water platform facies, leaving the biosphere in deep-water regions insufficiently understood. This study presents a detailed examination of a fossil assemblage from the Liuchapo Formation at the Jiaobang section, Jianhe County, Guizhou Province. The Liuchapo Formation represents a slope setting. Through acid etching and thin section observations, we have discovered abundant fossils, including sponge spicules, hyoliths, potential protoconodonts (? Protohertzina sp.)and zhijinitids (? Zhijinites sp.), spherical acritarchs, Megathrix longus and various types of multicellular algae, as well as problematic Poratusiramus sp., globular fossils, and morphologically diverse filamentous and sheet-like fossils. This fossil assemblage belongs to the Fortunian (earliest Cambrian), and the skeletal remains are dominated by sponge spicules. This fossil assemblage includes taxa shared with shallow-water environments and taxa exclusive to deep-water settings. These results augment the palaeontological data from the Fortunian slope facies. This assemblage is significant for potential stratigraphic correlation and evolutionary studies.

国家重点研发计划项目(2022YFF0800100)和国家自然科学基金(42330209, 41972016)联合资助