The Upper Cretaceous Gaogou, Majiachun and Sigou formations in the Xixia Basin are composed of terrestrial clastic deposits, which are dominated by red-violet mudstones, muddy siltstones, siltstones, grayish fine-grained sandstones, intercalated with grayish, off-white medium- and coarse-grained sandstones or conglomerates. They contain 10 ichnogenera and 22 ichnospecies and Rhizoliths, including Arenicolites isp., Archaeonassa isp., Beaconites antarcticus, B. capronus, B. coronus, Cylindricum isp., Gastruichnus xixiaensis, Palaeophycus megas, P. tubularis, P. heberti, P. sulcatus, P. cf. sulcatus, P. striatus, Planolites beverleyensis, P. isp., Scoyenia gracilis, Skolithos verticalis, S. linearis, S. isp., Taenidium irregularis, T. serpentinum and T. barretti. From north to south across the basin, alluvial fan, braided and meandering fluvial and fluvio-lacustrine systems are recognised on the basis of sedimentary features. In reference to them, four ichnoassemblages are recognised: (1) Skolithos-Gastruichnus ichnoassemblage in the channel environment of braided and meandering river, (2) Beaconites-Taenidium ichnoassemblage in the natural levee and crevasse splays, (3) Beaconites-Palaeophycus ichnoassemblage in the flood plain and (4) Taenidium-Scoyenia ichnoassemblage in the periodically exposed fluvio-lacustrine (pond or very shallow lacustrine) sedimentary environments. The present work not only enrich the trace fossils database of terrestrial origin but also offer new data to complete further continental ichnofacies mode and also provide the constraints on palaeoenvironments of the Xixia Basin.

中文翻译：

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豫西南西夏盆地上白垩统微量化石及沉积环境

西夏盆地上白垩统高沟组、马家村组和四沟组由陆相碎屑沉积组成，以红紫色泥岩、泥质粉砂岩、粉砂岩、灰色细粒砂岩为主，夹有灰色、灰白色中、粗粒砂岩或砾岩。它们包含 10 种鱼属和 22 种鱼种和根石类，包括石稗属、古生菌属、南极针刺属、B. capronus、B. coronus、Cylindricum isp.、Gastruichnus xixiaensis、Palaeophycus megas、P. hebertii、P. sulcatus, P. cf. sulcatus, P. striatus, Planolites beverleyensis, P. isp., Scoyenia gracilis, Skolithos verticalis, S. linearis, S. isp., Taenidium wirelessis, T. serpentinum 和 T. barretti。自北向南横跨盆地，冲积扇，辫状和蜿蜒的河流和河湖系统是根据沉积特征识别的。参考它们，识别出四种鱼群组合：（1）辫状河道环境中的Skolithos-Gastruichnus ichnosemblage，（2）天然堤防和裂隙口中的Beaconites-Taenidium ichnosemblage，（3）Beaconites-Palasseo洪泛平原和 (4) Taenidium-Scoyenia ichnosemblage 在周期性暴露的河湖（池塘或非常浅的湖）沉积环境中。目前的工作不仅丰富了陆源遗迹化石数据库，而且为进一步完善大陆地相模式提供了新数据，也为西夏盆地古环境提供了约束条件。