四川简阳晚侏罗世马门溪龙

Mamenchisaurus FROM UPPER JURASSIC OF JIANYANG, SICHUAN

记述了产自四川简阳三星镇蟠龙村上侏罗统蓬莱镇组的恐龙化石材料。经研究后,鉴定为马门溪龙(未定种)Mamenchisaurussp.,这是四川盆地首次在上侏罗统蓬莱镇组顶部找到马门溪龙化石。它的发现扩大了马门溪龙属的地理分布和地史分布范围,为今后在四川和邻区上侏罗统顶部寻找蜥脚类恐龙化石指出了新的方向。同时,根据马门溪龙化石近年不断被发现和地史分布的逐步扩展,认为对马门溪龙的地质时代应重新认识。

The dinosaur fossils at Sanxingzhen, Jianyang, Sichuan, are found in the Latter Jurassic Penglaizhen Formation. They are identified as Mamenchisaurus sp. through abundant researches. This is the first time to find the Mamenchisaurus fossils in the top of the Latter Jurassic Penglaizhen Formation. The discovery not only enlarges the range of Mamenchisaurus' geographical history, but also points out a new way to look for sauropoda of Latter Jurassic in Sichuan and the neighbouring areas. At the same time, according to the continuous discovery and the progressive expansion of geographical history of Mamenchisaurus, this paper suggests that the geologic age of Mamenchisaurus should be reconsidered.