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鄂尔多斯盆地西南部的志丹群颇为发育,出露良好,含有丰富的叶肢介化石.在甘肃华亭-陕西陇县地区的峰山组、泾川组以及华池-环河组首次发现并采集到丰富的叶肢介化石,经研究有3属29种:Qaidamestheria 8新种,Yanjiestheria 18种(新种6个),Palaeolimnadia 3新种.根据Yanjiestheria动物群的特征,本文认为志丹群泾川组应归为早白垩世;峰山组连续沉积在泾川组之上,划归早白垩世比较妥当,华池-环河组暂归为早白垩世.
The Zhidan group in the southwestern part of the Ordos Basin is quite developed and well exposed with abundant leaf-exoduomet fossils. It was first discovered and collected in the Fengshan Formation, Jingchuan Formation and Huachi-Huanhe Formation in Huating, Gansu, Shaanxi Province To abundant foliar mesotrons, there are 3 genera and 29 species in this study: 8 new species of Qaidamestheria, 18 species of Yanjiestheria (6 new species) and 3 new species of Palaeolimnadia.According to the characteristics of Yanjiestheria fauna, The group should be classified as Early Cretaceous; the Fengshan Formation is deposited continuously above the Jingchuan Formation, which is well placed in the Early Cretaceous, and the Huachi-Huanhe Formation temporarily belongs to the Early Cretaceous.