A new trace fossil genus from Jurassic Longzhaogou in Eastern Heilongjiang, china

The Jurassic marine trace fossil described has been found for the first time from the Upper Jurassic Yunshan Formation, County, Mishan Eastern Heilongjiang. It is a new trace fossil genus occurring at the Upper surface of a black mud—stone. The new trace fossil genus Mishanichnus is described below: Ichnus showing long,simple sinuous, width of trail 4 to lo mm., both sides not smooth, but border cleared quite. Median consisted of numerous meniscus ribs ranged by different interval. No branching.