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山东郯城和江苏东海早白垩世晚期恐龙足迹化石新发现及古环境*

, PP. 489-504

Keywords: 山东郯城,江苏东海,早白垩世,恐龙足迹,古环境

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Abstract:

首次在山东郯城早白垩世晚期地层中发现恐龙足迹化石,分属蜥脚类和兽脚类恐龙足迹,足迹大小差异较大。通过对山东省郯城县新发现的2处恐龙足迹化石点和江苏省东海县南古寨恐龙足迹化石点的对比研究,探讨了足迹类型、大小、速度与足迹深度的关系,发现同等条件下,蜥脚类恐龙足迹通常较兽脚类足迹深,而蜥脚类恐龙足迹深度随着足迹大小的增加有变深的趋势;波痕、雨痕和泥裂等沉积构造以及足迹回填和叠覆现象对足迹化石保存形态和细节有较大影响,而构造变形对足迹形态和行迹并无明显影响,但高角度的构造变形会加速差异风化,使足迹化石更易暴露而被破坏。对研究区古环境与古生态的研究表明,早白垩世晚期研究区经历了水体逐渐变浅、气候由湿到干并伴随短暂间歇性干旱的过程,沉积环境由河湖演变为三角洲前缘、并逐渐过渡到三角洲平原,生态环境逐渐恶化,动植物由兴而衰、逐渐减少。

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