重庆綦江白垩系夹关组恐龙足迹群沉积环境

重庆綦江莲花保寨保存有大量以莲花卡利尔足迹为主的恐龙足迹,研究其沉积环境对恢复当时恐龙动物群的生活环境有着十分重要的意义。运用岩石学、沉积学和古生物学方法,通过岩石学特征、沉积构造特征、粒度分布特征等分析重庆綦江莲花保寨恐龙足迹群的沉积环境,认为当时的沉积环境为曲流河沉积,恐龙足迹的赋存层位为曲流河边滩和河漫滩环境。     

重庆綦江白垩系夹关组遗迹化石及其沉积环境

遗迹化石大都是原地埋藏,研究遗迹化石在古环境、古气候、古海洋和古生态等方面的重建具有重要的意义。綦江国家地质公园老瀛山园区夹关组地层中已发现的无脊椎动物遗迹化石经鉴定包括1大类3属3种,分别为觅食迹Scoyenia gracilis(纤细斯柯茵迹)、Beconites antarcticus(南极似塔形迹)和Planolites beverleyensis(贝弗利漫游迹)。这些遗迹化石都属于Scoyenia遗迹相,代表了研究区在白垩纪夹关期为间断性暴露地表的河漫滩或者滨浅湖环境。     

石花形恐龙幻迹:中国重庆綦江区下白垩统夹关组的罕见遗迹化石（英文）

在中国重庆綦江区虎山足迹点发现了2个大型恐龙天然足模化石,化石赋存于砂质富集的夹关组的一悬崖底面。它们属于罕见的幻迹,同类足迹也发现于韩国和北美白垩系足迹点。放射状、同心及半脆性形变使这些幻迹具有切断状或网状外观,有时呈现出类似裂断花或菜花的形态。这正是当地"石头开花"民间传说的来源。这些特征表明,造迹者必然是恐龙,同时也清晰地展现了其外形态学特征。     

重庆綦江中白垩统夹关组恐龙足迹群的发现及其意义

记述了来自重庆綦江中白垩统夹关组恐龙足迹群，命名了甲龙亚目的中国綦江足迹（Qijiangpussinensis ichnogen．et ichnosp．nov．）、兽脚亚目的敏捷舞足迹（Wupusagilis ichnogen．etichnosp．nov．）和鸟脚亚目的炎热老瀛山足迹（Laoyingshanpus torridus ichnogen．etichnosp．nov．）和莲花卡利尔足迹（Caririchniumlotusichnosp．nov．）等新属种。中国綦江足迹是中国首次发现甲龙类的足迹。莲花卡利尔足迹提供了鸭嘴龙类在各发育阶段所留下不同的足迹。     

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

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;...     

辽宁省四合屯下白垩统义县组的兽脚类足迹化石和可能的造迹者

记述了辽宁省四合屯下白垩统义县组三个半恐龙足迹,归入似鹬龙足迹（亦译为跷脚龙足迹）一未定种（Grallator isp.）。这是义县组恐龙足迹化石的首次描述。该行迹至少由3个造迹者所造。从足迹推断恐龙体长1.51m,属于义县组兽脚类恐龙较为普遍的体长范围。重建了尾羽鸟(Caudipteryx)和中华龙鸟(Sinosauropteryx)的足部,前者的足迹轮廓与似鹬龙足迹未定种的吻合度超过后者。根据化石记录,似鹬龙足迹类型可能广泛存在于义县组的各种中小型兽脚类（驰龙类与伤齿龙类除外）中。     

辽宁省四合屯下白垩统义县组的兽脚类足迹化石和可能的造迹者

记述了辽宁省四合屯下白垩统义县组三个半恐龙足迹,归入似鹬龙足迹（亦译为跷脚龙足迹）一未定种（Grallator isp.）。这是义县组恐龙足迹化石的首次描述。该行迹至少由3个造迹者所造。从足迹推断恐龙体长1.51m,属于义县组兽脚类恐龙较为普遍的体长范围。重建了尾羽鸟(Caudipteryx)和中华龙鸟(Sinosauropteryx)的足部,前者的足迹轮廓与似鹬龙足迹未定种的吻合度超过后者。根据化石记录,似鹬龙足迹类型可能广泛存在于义县组的各种中小型兽脚类（驰龙类与伤齿龙类除外）中。     

民和盆地下白垩统遗迹化石的类型与气候的关系

民和盆地下白垩统首次发现7个遗迹属,早期的朱家台组为Skolithos-Planolites组合,中期的盐锅峡组为Thalassinoides-Palaeophycus组合,晚期的红古城组为Planolites-Scoyenia组合。这些遗迹属在纵向上可以出现相行为。表明水深不是主控因素,而是古气候的作用。     

冀西北尚义上侏罗统—下白垩统后城组恐龙足迹新发现及生物古地理意义*

简要报道了新近首次在冀西北张家口尚义地区发现的恐龙足迹。野外地质调查发现,恐龙足迹赋存于尚义晚中生代盆地侏罗系—白垩系后城组顶部。恐龙行迹呈近东西向展布,由数十个足迹构成。初步研究表明,造迹者分别属于兽脚类和蜥脚类恐龙,由西向东行进。足迹中包括兽脚类足迹70余个,组成数个行迹;蜥脚类足迹15个,构成1列行迹。蜥脚类足迹特征显示其可能属于游泳状的行迹。华北北部土城子组/后城组发育于燕辽生物群—热河生物群更替演化时期（晚侏罗世—早白垩世早期）,以往在该时期沉积物中罕见脊椎动物骨骼化石。近年来华北北部土城子组/后城组中频繁发现的恐龙足迹表明,燕辽生物群—热河生物群更替演化时期发育着以恐龙为代表的脊椎动物群。该发现将有助于进一步了解土城子组/后城组沉积时期恐龙属种的多样性及其生物古地理环境。晚侏罗世—早白垩世早期沉积古地理和古生态环境及其与恐龙动物群发育的研究有助于揭示陆地生物群更替演化和环境的关系。     

重庆市綦江县莲花保寨：中国古人与恐龙足迹共存的直接证据

重庆市綦江县老瀛山莲花保寨除了大量多样化的恐龙足迹之外,还保存了完好的要塞结构及历代题刻。从古迹可知,莲花保寨最早可追溯到南宋宝祐四年（1256年）,很可能是当地人躲避蒙元军队对尚属南宋统治下的蜀地的进攻之用。此后,清朝又在此留下多处古迹。这些古迹与大量（至少以5种不同方式保存的）恐龙足迹（尤其是鸭嘴龙类足迹）共存,构成了中国古人在恐龙足迹化石点上长时间生活（可能长达700余年）的直接证据。而莲花保寨的泥裂、鸭嘴龙类足迹和波痕被引申为荷叶叶脉、莲花和水环境,也成为＂莲花保寨＂得名的证据。这项研究表明恐龙足迹参与了中国部分古地名、民间传说的形成,这些古地名、民间传说或可成为寻找恐龙足迹的重要线索。     

The longest theropod trackway from East Asia,and a diverse sauropod-, theropod-, and ornithopod-track assemblage from the Lower Cretaceous Jiaguan Formation,southwest China

Here we report a large dinosaur tracksite from an extensive fluvial sandstone surface in the Lower Cretaceous Jiaguan Formation of Sichuan Province, China. The site contains over 250 individual tracks comprising at least 18 recognizable trackways, including the longest theropod trackway (cf. Eubrontes) known from China. This exceptional theropod trackway consists of 81 successive footprints covering a distance of 69 m. The tracks are well-preserved and are expressed both as true tracks on the main “upper” surface and as transmitted undertracks on a locally exposed “lower” bed. Also recorded are six other theropod trackways, including small Grallator-like ichnites, eight sauropod trackways (cf. Brontopodus), and three small ornithopod (cf. Ornithopodichnus) trackways with a parallel orientation, which may indicate gregarious behavior. Several trackways of a larger theropod trackmaker show pes imprints with elongated traces of the metatarsals, suggesting extramorphological (substrate-controlled) variation and/or plantigrade posture, which is here interpreted as indicating a change in gait assumed in response to deep and soft sediment. The assemblage indicates a diverse dinosaur fauna in the Lower Cretaceous Sichuan Basin with variously sized theropods, sauropods, and ornithopods. The late occurrence of footprints of the Grallator-Eubrontes plexus in Lower Cretaceous strata is further evidence of the extended stratigraphic range of this morphotype and the distinct palaeobiogeographic distribution of these trackmakers in East Asia.     

Theropod assemblages and a new ichnotaxon Gigandipus chiappei ichnosp. nov. from the Jiaguan Formation,Lower Cretaceous of Guizhou Province,China

A newly discovered Jiaguan Formation(Lower Cretaceous) tracksite from the Linjiang region of Guizhou Province, China, reveals the first example of a Cretaceous track morphotype attributable to the non-avian theropod ichnogenus Gigandipus, here named Gigandipus chiappei ichnosp nov. The theropod dominated locality also reveals the second report of the avian theropod ichnogenus Wupus, one of the largest avian traces currently known from the Lower Cretaceous. The Linjiang site provides evidence to support previous interpretations of a distinctive Lower Cretaceous theropod-dominated ichnofauna that was widespread in China and East Asia and highlights the similarity between Lower Cretaceous theropod ichnotaxa in East Asia and those found in the Lower Jurassic both in East Asia and elsewhere. These similarities in turn create various ichnotaxonomic challenges familiar to researchers working on theropod tracks, and we recommend caution in the naming of new theropod ichnotaxa at the ichnogenus level.     

Microbially-induced sedimentary wrinkle structures and possible impact of microbial mats for the enhanced preservation of dinosaur tracks from the Lower Cretaceous Jiaguan Formation near Qijiang (Chongqing,China)

Recently, a paleosurface with microbially-induced sedimentary wrinkle structures that are associated with abundant, well-preserved, iguanodon-type, tridactyl tracks has been documented at the Lotus tracksite near Qijiang (Chongqing, China) in fluvial deposits of the Lower Cretaceous Jiaguan Formation. Two different wrinkle structure types are identified and described from a macroscopic point of view and also by applying microstructure analysis with a scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) and other high-resolution instruments, that detected sheath-like and globular organic matter and thus confirm the microbial origin of the observed wrinkle structures. A model for the formation of the two microbial mat induced wrinkle structure types and associated preservation of dinosaur tracks is proposed. Finally, some human footprints were left in comparable modern environments covered with a thin microbial mat, and they are used as a modern analog in order to better understand the track formation and preservation mechanisms of the dinosaur tracks of the Lotus tracksite.     

重庆市綦江县莲花保寨:中国古人与恐龙足迹共存 的直接证据

重庆市綦江县老瀛山莲花保寨除了大量多样化的恐龙足迹之外,还保存了完好的要塞结构及历代题刻。从古迹可知,莲花保寨最早可追溯到南宋宝祐四年(1256年),很可能是当地人躲避蒙元军队对尚属南宋统治下的蜀地的进攻之用。此后,清朝又在此留下多处古迹。这些古迹与大量(至少以5种不同方式保存的)恐龙足迹(尤其是鸭嘴龙类足迹)共存,构成了中国古人在恐龙足迹化石点上长时间生活(可能长达700余年)的直接证据。而莲花保寨的泥裂、鸭嘴龙类足迹和波痕被引申为荷叶叶脉、莲花和水环境,也成为“莲花保寨”得名的证据。这项研究表明恐龙足迹参与了中国部分古地名、民间传说的形成,这些古地名、民间传说或可成为寻找恐龙足迹的重要线索。     

基于恐龙足迹重建攀西地区白垩纪恐龙动物群

攀西地区没有白垩纪恐龙骨骼化石记录,对该区白垩纪恐龙动物群组合的认识尚属空白。1991年,攀西地区首次发现了恐龙足迹,此后陆续发现了8个足迹点。这些足迹点共发现9种不同的非鸟恐龙足迹(6种非鸟兽脚类、1种蜥脚类和2种鸟脚类足迹),以及翼龙和龟类足迹。共11种足迹形态类型由185道行迹(与孤立足迹)组成,可能代表着同等数量的造迹者。其中飞天山组的组合多样性最强,小坝组和雷打树组较弱。这个相对全面的足迹数据库,为该地区白垩纪四足类的古生态学普查提供了动物群的组成信息,这在该缺乏骨骼化石的地区显得尤为重要。     

陕西中鸡发现白垩纪恐龙足迹群

在鄂尔多斯盆地东北缘神木市中鸡一带下白垩统洛河组上部紫红色薄层砂岩层面中,发现丰富的恐龙与其他四足类的足迹化石。这些足迹可分为3类,分别为三趾型兽脚类足迹(实雷龙足迹类),两趾型兽脚类足迹(恐爪龙类足迹)和小型四足类足迹(哺乳形类/兽孔类足迹)。此种组合在中国尚属首次发现,对古气候、古环境、古地理和地层对比都具有重要的意义。     

四川西昌盆地白垩纪恐龙足迹群的新发现

四川西昌盆地白垩系小坝组尚未发现骨骼化石记录,其白垩系恐龙动物群的信息全赖于足迹化石。2017年,在喜德县洛甘发现小坝组迄今最大型的恐龙足迹群。该足迹点保存了大量的兽脚类足迹。足迹保存条件较差,但具备了基本的形态学特征。总体来看,兽脚类足迹具有尺寸较小(8~13cm),中等中趾前凹(0.5~0.6)和第Ⅱ趾和第Ⅳ趾间较宽趾间角(70°~100°)的特征;少量足迹保存了跖骨垫。初步分析认为,洛甘兽脚类足迹与四川盆地夹关组的兽脚类足迹Eubrontes和Grallator形态类型相似,为两地在白垩纪中期具有类似的恐龙动物群的观点提供了新的证据。该发现对于西昌盆地的古气候、古地理和地层对比都具有重要的意义,足迹详细分类还有待进一步研究。