571万年前的各种贝和碳状动物微化石的黎明
Luana Morais1,2, Bernardo T Freitas3, Thomas Rich Fairchild4
1Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo (USP), São Paulo, SP, Brazil. lumoraiss@ymail.com.
Scientific reports
|June 28, 2024
概括
早期的动物多样化比以前想象的更早发生. 来自巴西的各种微化石.
科学领域:
- 古生物学的古生物学
- 地质时间学 (Geochronology)
- 进化生物学 进化生物学
背景情况:
- 埃迪亚卡拉-坎布里亚过渡期是动物多样化的关键时期.
- 以前的化石记录表明,在5.5亿至5.3亿年前出现了体有机体和小型体化石.
- 早期甲动物多样化的精确时间仍然是研究的主题.
研究的目的:
- 为了研究早期的微化石多样性在埃迪亚卡兰博卡纳形成,巴西.
- 通过放射测年法确定这些微化石的精确年龄.
- 为了确定甲动物的多样化是否早于先前确定的时间表.
主要方法:
- 从细片和手样中分析微化石,分为五种类型 (ES,EF,EQ1,EQ2,CE).
- 碳酸与 (U-Pb) 约会的应用,以确定博卡纳岩层的年龄.
- 化石发现与已建立的生物层级地理区域的比较.
主要成果:
- 在博卡纳形成中发现了多种微化石,包括潜在的早期元生动物.
- 新的U-Pb测年法将博卡纳形成定在571±900万年前.
- 这些发现表明,包括生物矿物化形式在内的甲动物多样化显著早于Cloudina-Corumbella-Namacalathus生物区.
结论:
- 甲动物的多样化,包括早期的生物矿物化形式,明显比以前记录的时间更早.
- 博卡纳形成为复杂的动物生命的早期起源提供了关键证据.
- 这项研究完善了我们对埃迪亚卡拉时期动物进化的时间表的理解.
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