赣东北铅山县二叠纪雾霖山组底部含Shouchangoceras的海相动物群的发现

PERMIAN AMMONOID Shouchangoceras BEARING MARINE FAUNA FROM THE LOWEST WULINSHAN FORMATION IN QIANSHAN COUNTY, NORTH EAST JIANGXI

赣东北雾霖山组长期被视为吴家坪期的陆相沉积，在其近底部发现含Ｓｈｏｕｃｈａｎｇｏｃｅｒａｓ的海相化石群，表明该岩组并非纯陆相沉积，其底部的地层时代亦不排除茅口期晚期的可能。

The Wulinshan Formation in north east Jiangxi has long been thought as the Permian Wuchiapingian continental deposit. Recently, an ammonoid Shouchangoceras bearing marine fauna was found from the horizon near the base of the formation at a local coal mine of Sha Ping Li near Hufang, Qianshan County, Jiangxi. This fauna includes a few bivalves and rare trilobites. It indicates that the formation consists mainly of continental deposits, but some marine deposits appear in the lower part. The new discovery suggests that either the geological range of the ammonoid genus Shouchangoceras may extend up to the early Wuchiapingian or the tectonic sedimentary meaning of the pebbled feldspar quartz sandstone at battom of the formation has to be reconsidered.