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在蒙古南部波尔海尔汗乌尔(Bor hairhanuul)剖面的塔琳波格德组下部的6个样品中发现了牙形刺,通过研究清楚地表明含牙形刺动物群的塔琳波格德组下部的时代是中洛霍考夫阶(早泥盆世)到中艾菲尔阶(中泥盆世)。塔琳波格德组的牙形刺动物群更接近于北美同时期的动物群,而与欧洲同期动物群相远。这一动物群可能属于冷水动物群。作者在文中描写了一个新种:Steptotaxis mongolianus sp.nov.Wang。
Condyloma was found in six samples in the lower part of the Tallinn Pogdeo Formation in the Bor hairhanuul section of southern Mongolia and was clearly identified by studies of Tarin Pogod The age of the lower part of the group is Middle Lohoff Kaufman (Early Devonian) to Middle Eifelian (Middle Devonian). The Tabolinog group of conodont fauna is closer to the same North American fauna as the European fauna of the same period. This fauna may belong to the cold water fauna. The author describes a new species in the text: Steptotaxis mongolianus sp.nov.Wang.