石同位素揭示了全球独特的早期米奥森时代鱼的组合
Felix G Marx1,2, Ambre Coste2, Marcus D Richards2
1Museum of New Zealand Te Papa Tongarewa, Wellington, New Zealand.
Journal of the Royal Society of New Zealand
|October 23, 2024
概括
早期米奥森时代的白类鱼对人类的了解很少. 新西兰新西兰新西兰新西兰
科学领域:
- 古生物学的古生物学
- 海洋生物学 海洋生物学
- 地质时间学 (Geochronology)
背景情况:
- 最早的米欧纪 (阿奎坦纪) 是类动物进化,特别是鱼 (mysticetes) 进化中采样较少的时期.
- 奥利古纪-米奥纪的边界显示了类动物化石记录的全球转变,神秘物和古老的形物消失了.
- 新西兰的化石记录独一无二地表明,大白持续存在到最早的中世纪,但生物分层学分辨率一直缺乏.
研究的目的:
- 为了调查在新西兰在初代米奥森时期的类动物,特别是神秘的持久性.
- 为了提高新西兰海洋化石记录中奥利古纪-米奥纪边界的生物分层学分辨率.
- 为了解决在阿奎坦亚时期的鱼进化的"黑暗时代".
主要方法:
- 使用同位素比率 (Sr/Sr) 来测定23个Lentipecten贝的年代.
- 日期的贝与16个mysticete和7个odontocete化石标本的协会.
- 地质年代学数据的应用,以解决鱼化石的年龄.
主要成果:
- 八个新的日期属于早期米奥森,七个具体属于阿奎塔尼亚 (23-20万年前).
- 五个阿奎塔尼亚日期的标本是神秘的,证实了他们在这个时期的存在.
- 这项研究为鱼化石提供了精确的日期,增强了生物层状图分辨率.
结论:
- 新西兰的鱼化石记录是独一无二的,对于理解早期米奥森海洋哺乳动物进化而具有全球意义.
- 这些发现证实了在阿奎坦纪期间新西兰鱼的持续存在,挑战了以前的全球解释.
- 这项研究为未来研究早期米奥森类"黑暗时代"的原因和影响提供了关键数据.
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