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中国陕西神木中生代早期地层中的重要鸟臀类恐龙足迹化石产地

2012-05-21 13:28  李建军

An important Ornithischian tracksite in the Early Mesozoic of the Shenmu Region, Shaan, China

 

LI Jianjun1,  Martin G. LOCKLEY2, ZHANG Yuguang1,  HU Songmei3, Masaki MATSUKAWA4, BAI Zhiqiang5

 

1, Beijing Museum of Natural History, 126 Tian Qiao, South Street, Beijing,  China 100050

2, Dinosaur Tracks Museum, CB 172, University of Colorado at Denver, PO Box 173364, Denver, Colorado, 80217-3364 USA

3, Archaeological Research Institute of Shaanxi ProvinceXi’an, Shaanxi, China 710054

4, Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan

5, School of Earth and Space Sciences, Peking University, 5,Yiheyuan Road, Haidian District, Beijing, 100871  

 

ABSTRACT

       A large track site with multiple, well-preserved trackways of an Early Mesozoic quadrupedal ornithischian dinosaur is the first report of Moyenisauripus-like trackways from Asia, herein named Shenmuichnus youngteilhardi.  The tracks occur in a clastic fluvial sequence in the Fuxian Formation in Shenmu County,  Shaanxi Province, which is in the same general region as the discovery site of the first dinosaur track (Sinoichnites) reported from China.  Based on size and morphology, it is likely that Sinoichnites, which is now lost,  also represents an ornithischian.   The Shenmuichnus youngteilhardi trackways show two modes of preservation: the first representing deeper tracks, with sediment rims, results in Deltapodus-like tracks, with indistinct pes digit traces and sub-circular manus traces, the second produces Moyenosauripus-like tracks, with clear tridactyl and  pentadactyl digit traces in the pes and manus respectively. Thus the Shenmu trackways play a key role in resolving globally significant ichnotaxonomic problems surrounding the nomenclature of Sinoichnites, Moyenosauripus, Deltapodus and other named (Ravatichnus) and unnamed trackways from Asia, Africa and Europe.  In addition they shed important light on the paleogeographical and paleoecological distribution of quadrupedal ornithischians in the Early Mesozoic. The track site has been the focus of a major excavation to transfer the trackways from their original remote location to the new Shenmu Museum, in Shenmu City. Other tracksites in the area which reveal Anomoepus, Grallator and the Deltapodus morphotype, together with Shenmuichnus and plant fossil evidence, suggests an Early Jurassic age for the tracksite.

 

Key word: Dinosaur tracks, Early Jurassic, Shemu Shaanxi

 

 

 

中国陕西神木中生代早期地层中的重要鸟臀类恐龙足迹化石产地

李建军1 马丁洛克里2 张玉光1 胡松梅3 松川正树3 白志强5

    

1, 北京自然博物馆, 北京天桥南大街126 100050

2, 美国科罗拉多大学恐龙足迹博物馆PO Box 173364, Denver, Colorado, 80217-3364 USA

3, 陕西考古研究所, 陕西 西安710054

4, 日本东京学艺大学环境科学系 Koganei, Tokyo 184-8501, Japan

5, 北京大学地球于空间科学学院, 中国北京, 100871  

中文摘要

       陕西神木发现的中生代早期四足行走鸟臀类恐龙足迹产地化石保存精美,是亚洲第一次发现Moyenisauripus 类型的恐龙足迹,本文建立新属新种:杨德氏神木足迹(Shenmuichnus youngteilhardi.)。足迹化石保存在陕西神木县栏杆堡乡邱井沟村侏罗纪早期富县组湖相沉积地层中。由于中国第一件恐龙足迹化石——中国足迹(Sinoichnites)也是在神木地区发现的,因此这次新发现具有特殊意义。从大小和形状来看,中国足迹属于鸟臀类恐龙的足迹。杨德氏神木足迹显示出两种保存方式:一种是比较深的足迹,足迹周围保存“挤压脊”,而形成Deltapodus类型的足迹形态,这种足迹形态具有清晰的后足趾迹和半圆形前足足迹;第二种保存方式为较浅的足迹,显示出Moyenosauripus类的足迹形态,前足五趾,后足三趾,而且趾迹十分清晰。因此,神木足迹的发现成为解决全世界足迹命名方面难题的一个关键性证据,它把Sinoichnites, Moyenosauripus, Deltapodus, Ravatichnus和其他一些在亚洲、非洲和欧洲发现,但尚未命名的足迹联系了起来。另外,神木足迹的发现在研究四足鸟臀类恐龙在中生代早期的古地理和古生态的分布方面提供了重要证据。由于这个足迹地点比较重要,神木博物馆将邱井沟地点发现的足迹挖掘至馆内保存。在距离邱井沟村地点直线距离3公里左右的李家南畖附近发现了第二个地点。这个地点保存有Anomoepus, Grallator Deltapodu以及神木足迹(Shenmuichnus),同时还发现了许多植物化石,显示出早侏罗世的时代特征。

 

关键词:恐龙足迹  陕西神木  早侏罗世