来自北达科他州的两个特别保存的生物群揭示了神秘的奥尔多维纪货架生态
Giovanni Mussini1, Nicholas J Butterfield1
1Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom.
概括
奥尔多维纪的小型碳化化石揭示了持久的,现代风格的架动物,挑战了早期古老时期海洋生态系统和化石保护的先前理解.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 在平流图学上,平流图学是平流图学.
背景情况:
- 奥尔多维纪时期经历了显著的进化辐射,在坎布里亚爆炸之后建立了现代动物主导的生态系统.
- 非矿化奥尔多维纪动物很少,通常在边缘环境中发现,限制了我们对典型海洋息地的理解.
研究的目的:
- 为了描述从史基拉顿沉积物中获得的小型碳化化石 (SCF),保存亚微米细节.
- 调查坎布里亚期以后,化石保存的长期持续情况.
- 揭示奥尔多维纪货架环境中的神秘类型和养适应性.
主要方法:
- 对来自Deadwood和温尼伯岩层的小型碳化化石 (SCF) 的分析.
- 使用相关的孔和石灰岩来测定SCF的年代.
- 对化石元素的显微镜检查,包括雷杜拉,皮质和虫结构.
主要成果:
- 鉴定了两个连续的生物群 (坎布里亚-特雷马多西亚和达里维利亚),证明了持续高质量的微化石保存.
- 发现了专门的软体动物,甲形,欧类型的皮质,和类虫.
- 证据表明神秘的种类和食策略与后来的古老生态形式同时发生.
结论:
- 奥尔多维纪货架息地拥有多样化,现代风格的动物群,通常不会在宏观化石记录中保存.
- 特殊的化石遗址可能不代表更广泛的奥尔多维纪生物圈.
- 高质量的微化石保存持续到奥尔多维纪,为早期动物进化提供了新的见解.
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