山西天镇晚白垩世一暴龙类及其埋藏环境

A tyrannosauroid from the Upper Cretaceous in Tianzhen, Shanxi Province, China and its burial environment

天镇地处山西北部,从早白垩世中期开始,区内古地理格局变化频繁,气候逐渐干旱。不断发现的化石材料表明,这一地区在白垩纪时曾经生存有甲龙类、鸭嘴龙类和蜥脚类恐龙。本文报道了该地区新近发现的一个暴龙类恐龙——王氏晋北龙,并对其埋藏环境进行了分析。结果表明,晋北龙为一处于中间演化阶段的暴龙超科恐龙,比雄关龙更晚分异。它的发现,表明天镇地区在晚白垩世曾经存在着一个由甲龙类、鸭嘴龙类、蜥脚类和兽脚类组成的恐龙动物群,其时代可能处于康尼亚克期至坎潘期。埋藏环境分析表明,晋北龙生前环境为环滨湖地带,死后骨架被短距离搬运,异地埋藏于静水浅湖环境中。

Tianzhen is located in the north of Shanxi Province. Since the middle of the Early Cretaceous, the paleogeographic landscape in this area changed frequently and the climate became more and more arid. Continuously discovered fossil materials indicate that ankylosaurs, hadrosaurs and sauropods once existed in this area during the Cretaceous. In this article we report a newly discovered tyrannosauroid-Jinbeisaurus wangi, and analyse its burial environment. Analysis shows that Jinbeisaurus is a mid-grade tyrannosauroid and derived than Xiongguanlong,which also belongs to a mid-grade tyrannosauroid. Discovery of Jinbeisaurus indicates a dinosaur fauna composed of ankylosaurs, hadrosaurs, sauropods and theropods in Tianzhen area during the Late Cretaceous, and its age may be between the Coniacian and the Campanian.Burial environment analysis reveals that Jinbeisaurus lived in shore lake before its death, and was buried in shallow lacustrine environment after a short distance transport.