来自阿塔巴斯卡油砂的化石痕迹,加拿大阿尔伯塔省,加拿大
概括
来自下白纪麦克默雷形成的各种石化化石表明附近的海洋海岸线. 这些痕迹化石提供了对古代环境和沉积物中的生命的关键见解.
科学领域:
- 古生物学的古生物学
- 沉积物学的沉积物学
- 在平流图学中,平流图学.
背景情况:
- 麦克默雷形成代表着一个重要的下白期沉积物,但它的古环境解释往往受到直接生物证据稀缺的限制.
- 印诺化石或痕迹化石提供了不可估量的古代生活和行为的间接证据,为沉积环境提供了独特的见解.
- 了解麦克默雷形成的沉积环境对于区域地质和古生物学研究至关重要.
研究的目的:
- 为了识别和描述下白纪麦克默雷形成的中部和上部部分的鱼类化石套件.
- 利用石化化石的分布和丰富性来推断古老环境条件,特别是与海洋海岸线的距离.
- 为了重建麦克默雷形成中的深道复合体的生物成分和沉积设置.
主要方法:
- 从表面暴露中系统地收集和识别 ichnofossils.
- 对鱼类多样性和丰度的分析.
- 在沉积物环境中绘制生物质结构的空间分布图.
主要成果:
- 鉴定出了一个多样化且保存良好的鱼类化石套件,代表至少十种鱼类.
- 鉴定到的岩石化石是麦克默雷岩层沉积物的原始生物居民的少数直接指标之一.
- 这些痕迹化石的观察到的分布和丰度模式强烈表明,深海峡综合体与附近的海洋海岸线之间存在密切联系.
结论:
- 石化化石组合提供了强有力的证据,证明了麦克默雷形成的沉积过程中的古环境条件.
- 特定的伊科塔克萨和它们的分布模式的存在证实了浅海或边缘海洋的影响.
- 这项研究增强了我们对麦克默雷形成的沉积环境及其与早期白时期海洋入侵的关系的理解.
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