在四川都江堰，古生物学专家发现了2亿年前恐龙留下的“时间足迹”。
On December 6, the reporter learned from a team of experts led by Xin Lida, associate professor of School of Earth Sciences and Resources, China University of Geosciences (Beijing) and leading researcher of Sichuan Zigong Dinosaur Museum, that the team of experts recently conducted preliminary investigation of several dinosaur footprints and other vertebrate footprints on a rock wall near Jiuding Street in Dujiangyan, Sichuan Province. It has been confirmed that there are more than 20 types of fossil footprints of ancient animals from the late Triassic, approximately 200 million years ago.
岩壁上有多个恐龙脚印。 （照片由受访者提供）
Xin Lida said this is the first time fossils of dino footprints have been discoveredsaurians in Dujiangyan, Sichuan province, and provides valuable physical clues for deciphering the ear恐龙的进化和远古环境的重建。
该遗址位于四川省都江堰市九鼎街附近的沉积岩壁上。 The stone was originally discovered by an outdoor enthusiast while hiking on November 23. Additional identification by the Sin Rida team of experts confirmed that they came from the Late Triassic strata, about 200 million years ago.
辛格·里达表示，初步调查显示，岩壁上共有20多个大小不等的脚印。主要分为中型和大型兽脚类足迹、小型兽脚类足迹和翼龙足迹三种类型。前两种示踪剂是恐龙，翼足类是祖龙。
在岩壁上发现手兽的脚印。 （照片由受访者提供）
Shin Rida said the theropod footprints are fossils of the typical three-toed footprints left by carnivorous dinosaurs when they walked on their hind legs.锋利的爪痕are usually visible on the toes.这是研究恐龙的运动、行为和生态的重要考古证据。手足类足迹是三叠纪时期原始爬行动物留下的脚印化石。 Its shape resembles a human hand.第五趾（外趾）异常外展在学术界引起了长期争议。据信，它可能是早期祖龙（例如伪角鼻龙）留下的。
Theropod footprints found on a rock wall. （照片由受访者提供）
“这个化石足迹的地方非常有价值，至少有四层保存下来的足迹，这表明恐龙在这里生活了很长时间，而且恐龙集中在这里，表明它曾经很活跃。辛格·里达说，更令人惊讶的是，研究人员还在足迹化石周围发现了树木化石。倒下的木柱和直立的木桩的残骸安详地躺在这里。”岩层中见证了两亿多年前的古老环境。
四川省自贡恐龙博物馆研究主任蒋翔表示，希望后续研究和发现的新材料能够进一步解开中国早期恐龙进化的秘密。 （记者董晓红）
