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首页> 外文期刊>Cretaceous Research >A diverse saurischian (theropod-sauropod) dominated footprint assemblage from the Lower Cretaceous Jiaguan Formation in the Sichuan Basin, southwestern China: A new ornithischian ichnotaxon, pterosaur tracks and an unusual sauropod walking pattern
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A diverse saurischian (theropod-sauropod) dominated footprint assemblage from the Lower Cretaceous Jiaguan Formation in the Sichuan Basin, southwestern China: A new ornithischian ichnotaxon, pterosaur tracks and an unusual sauropod walking pattern

机译：来自中国西南四川盆地下白垩统嘉关组的一种多样的蜥脚类目（兽脚类-蜥脚类目）占主导的足迹组合：一种新的鸟眼鱼科鱼类，翼龙轨迹和不寻常的蜥脚类恐龙步行模式

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A sample of fallen blocks of fluvial sandstone from the Lower Cretaceous Jiaguan Formation of Sichuan Province yielded an assemblage of dinosaur and pterosaur tracks preserved as natural impressions and casts. Collectively the assemblage reveals 132 tracks representing at least 30 trackways of tridactyl and didactyl theropods, sauropods, ornithopods and pterosaurs. Ichnotaxonomically, the trackways of small tridactyl theropods (pes lengths 7-18 cm) are indeterminable, whereas the trackway of a small didactyl dromaeosaur (pes length up to 7.5 cm) is tentatively assigned to cf. Velociraptorichnus. The sauropod trackways are assigned to cf. Brontopodus based on the medium to nearly wide-gauge pattern. Other characteristics are the U-shaped manus and strong heteropody. One sauropod trackway shows a peculiar pattern with a lack of left manus imprints, and an unusual position and rotation of right manus imprints. Different scenarios and explanations for this phenomenon are discussed. Ornithopod trackways are the most abundant in the sample and characterized by pes imprints of a small biped that are assigned here to the new ichnospecies Caririchnium liucixini. It is characterized by an unusual broad shape and weak mesaxony. Bivariate analysis of different Caririchnium ichnospecies reveals increasing mesaxony toward the larger forms, a trend that is the reverse of typical theropod ichnotaxa, where large imprints have weak mesaxony. Three isolated, small pterosaur tracks (two manus, one pes) are visible on a single surface. They show strong similarities to the widespread ichnogenus Pteraichnus. This is the ninth report of tetrapod tracks from the Jiaguan Formation in recent years and represents one of the most diverse assemblages recorded to date. It is also rare evidence of typical didactyl dromaeosaur tracks and the co-occurrence of sauropod and ornithopod tracks in a fluvial depositional environment representing arid climate conditions. (c) 2015 Elsevier Ltd. All rights reserved.
机译：四川省下白垩统嘉关组河床砂岩下落块的样本产生了一组恐龙和翼龙的痕迹，这些痕迹被保留为自然印模和铸模。集合显示132条轨迹，这些轨迹代表至少30条三track和双did类兽脚亚目，蜥脚类，鸟脚类和翼龙的轨迹。从分类学上讲，小型三足纲兽脚亚目（pes长7-18厘米）的步道是不确定的，而小型双十二指龙类（pes长达7.5厘米）的步道暂定为cf。 Velociraptorichnus。蜥脚类动物的航道已分配给cf。基于中等到近宽规格的花臂纲动物。其他特征是U型手掌和强异型。一条蜥脚类动物的走道显示出一种独特的模式，缺少左手的烙印，而右手的烙印没有特殊的位置和旋转。讨论了此现象的不同情况和解释。鸟足类走道是样本中最丰富的，其特征是小两足动物的pe印记被分配给新的鱼类物种Caririchnium liucixini。它的特点是异常宽大的形状和弱的中音。对不同的Caririchnium ichnospecies的双变量分析显示，中线向着较大形态的方向发展，这是典型的兽脚亚目鱼鳞生物的逆转趋势，在该物种中，大型烙印具有较弱的中线。在一个表面上可以看到三个孤立的小型翼龙轨迹（两个马努斯，一个比索）。它们与普遍的鱼鳞蕨有很强的相似性。这是近几年来嘉关组四足动物径迹的第九份报告，是迄今为止记录的最多样化的组合之一。在代表干旱气候条件的河流沉积环境中，也很少有典型的二乳糖基脉龙的踪迹以及蜥脚类和鸟脚类踪迹的同时出现。 （c）2015 Elsevier Ltd.保留所有权利。

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