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| 1 | 陕北地区下白垩统洛河组恐龙足迹的古生态学及地层学意义显示文摘陕北地区下白垩统洛河组恐龙足迹的发现为了解本地区恐龙的个体大小、运动方式、速度及生活习性等信息,恢复恐龙动物群面貌及古生态、古地理环境提供了化石证据。本文在前人研究的基础上,探讨了陕北地区下白垩统洛河组恐龙足迹在古生态学及地层学上的意义。对足迹形态特征的研究表明,陕北地区早白垩世恐龙足迹的造迹者体型较小,为小型兽脚类;对行迹特征的研究表明,造迹动物均处于正常行走状态,造迹恐龙以双足行走,而小型哺乳形动物为四足行走。靖边龙洲多条近于平行的恐龙行迹体现了小型兽脚类恐龙群居的生活习性;神木中鸡足迹组合为亚洲地区首次发现的具有典型沙漠相特征的巴西足迹遗迹相(Brasilichnium ichnofacies),为开展洲际地层对比提供了新的化石证据。陕北地区下白垩统洛河组的恐龙足迹拓宽了中国西北地区恐龙足迹的地理和地层分布范围,为探讨本区早白垩世恐龙动物群特征和演化及古生态、古地理、古环境等提供了条件和重要新材料。 | 李兴文 唐永忠 邢立达 王秦伟 吴昊 | 2021 | 地层学杂志2021，45，2： | 1 |
| 2 | The first theropod tracks from the Middle Jurassic of Gansu,Northwest China:new and rare evidence of quadrupedal progression in theropod dinosaurs显示文摘A new Middle Jurassic tracksite dominated by non-avian theropod footprints from the Wangjiashan Formation in Pingchuan District,Baojishan Basin,Gansu Province has yielded a unique trackway with four consecutive manus-pes sets.Only three previous examples,all Early Jurassic in age,of theropod trackways are known with convincing examples of manus tracks and in each case,only two tracks were recorded in association with pes tracks with metatarsal impressions and pelvic traces indicating crouching behavior.Thus,this is the first example of manus tracks registered while a theropod trackmaker was walking.This unique configuration is here designated as Grallator pingchuanensis ichnosp.nov.which shows the trackmaker forelimbs registering in a wide straddle gait,much wider than the pes trackway width.G.pingchuanensis confirms previous reports that theropods could occasionally register tridactyl,ectaxonic manus traces.In the case of the Pingchuan trackway,the short step indicates an animal moving at a slow speed,probably due to a soft substrate. | Da-Qing Li Li-Da Xing Martin G.Lockley Anthony Romilio Jing-Tao Yang Long-Feng Li | 2019 | Journal of Palaeogeography2019，8，2： | 0 |
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