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已知的最早的贡多瓦纳鸟类足迹:沃特哈吉形成 (白纪早期),维多利亚,澳大利亚
Anthony J Martin1, Melissa Lowery2, Michael Hall2
1Department of Environmental Sciences, Emory University, Atlanta, Georgia, United States of America.
PloS one
|November 15, 2023
概括
在澳大利亚发现的化石鸟类足迹提供了澳大利亚和冈德瓦纳鸟类生命的最早证据. 这些早期白纪的痕迹揭示了多样化的鸟类物种,并表明群居,季节性行为.
科学领域:
- 古生物学的古生物学
- 脊椎动物古生物学 脊椎动物古生物学
- 这种技术是什么?
背景情况:
- 澳大利亚和其他冈多瓦地区的白纪鸟类化石记录稀少,主要由罕见的骨碎片,羽毛和有限的痕迹证据组成.
- 以前的发现对这些古老的生态系统中早期鸟类种群的多样性和行为提供了很少的见解.
研究的目的:
- 记录和分析来自澳大利亚维多利亚州早期白纪Wonthaggi形成的鸟类足迹和痕迹化石的重要新组合.
- 为了确定澳大利亚和更广泛的冈多瓦纳大陆最早确认的鸟类存在.
- 根据种类学证据推断鸟类痕迹制造者的多样性及其古生态行为.
主要方法:
- 从Wonthaggi形成系统地挖掘和记录了27个鸟类足迹和相关的痕迹化石.
- 对轨道特征的形态分析,包括三形状,数字细度,分离角度,爪痕和形印记.
- 进行比较的技术分析,以识别潜在的轨迹制造者,并评估轨迹大小和变化.
- 基于沉积面 (环极河流-洪水平原) 和轨道组装特征的古环境重建.
主要成果:
- 发现了27个鸟类足迹,代表了在澳大利亚发现的最重要的早期白纪鸟类化石组合.
- 确认澳大利亚和冈德瓦纳最早的鸟类存在,可以追溯到巴雷米亚-阿普蒂亚阶段 (128-120万年前).
- 轨道形态表明多种多样的鸟类痕迹制造者,包括一些最大的早期白纪鸟类,有证据表明洪水平原表面的群居和季节性活动.
结论:
- 温塔吉形成为澳大利亚和冈德瓦纳早期的鸟类多样化和存在提供了关键证据.
- 发现的痕迹表明,早期的澳大利亚鸟类表现出复杂的行为,包括社会互动和季节性移动.
- 这一发现显著提高了我们对白时期鸟类进化和古生物地理学的理解.
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