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Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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伯吉斯页岩类型的奥尔多维纪动物群
Peter Van Roy1, Patrick J Orr, Joseph P Botting
1Department of Geology and Geophysics, Yale University, PO Box 208109, New Haven, Connecticut 06520, USA. peter.vanroy@yale.edu
Nature
|May 14, 2010
概括
软体动物,类似于伯吉斯页岩,持续到奥尔多维纪时期,这是摩洛哥新发现的化石所证明的. 这些发现挑战了关于坎布里亚动物灭绝和保护的先前假设.
科学领域:
- 古生物学的古生物学
- 在平流图学中,平流图学.
- 进化生物学 进化生物学
背景情况:
- 化石记录显示,在坎布里亚中期之后,伯吉斯页岩类型的软体动物数量下降.
- 这种衰退限制了我们对象性的坎布里亚纪分类物种及其进化轨迹的理解.
- 以前的解释表明,在以后的时期发生了重大灭绝事件或缺乏保存.
研究的目的:
- 为了调查坎布里亚类型软体动物在坎布里亚时期以外的持续存在.
- 为了确定新的化石遗址,以保护这些微妙的生物.
- 了解这些发现对大奥尔多维纪生物多样化事件的影响.
主要方法:
- 系统的古生物学实地考察和化石收集在下方和上方的Fezouata形成,摩洛哥.
- 详细分析发现的软体化石组合,重点关注形态学和分类学多样性.
- 化石载体形成的平流图相关性和年代.
主要成果:
- 在下奥尔多维纪Fezouata形成中发现了多样化和丰富的软体化石组合.
- 识别了许多典型与坎布里亚动物群相关的干群形态.
- 证据表明,伯吉斯页岩类型生物群在坎布里亚之后继续存在并被保存在合适的面体中.
结论:
- 伯吉斯页岩类型的软体动物在坎布里亚纪末期并没有完全消失,但持续到下奥尔多维纪.
- 费索瓦塔生物群表明,这种动物群的保存是依赖于种类的,而不仅仅是灭绝的迹象.
- 这一发现提供了坎布里亚生态系统与随后的奥尔多维纪生命辐射,特别是大奥尔多维纪生物多样化事件之间的关键联系.
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