东营凹陷古近系Paleodictyon遗迹化石的发现及意义

在东营凹陷纯梁地区古近系沙河街组中发现了Paleodictyon遗迹化石，其遗迹组构具有高丰度和低分异度的特征。观察发现，湖相Paleodictyon不仅比海相Paleodictyon的网孔长度和潜穴直径小得多，且网格形态趋于不规则化。通过对遗迹化石的遗迹组构分析，初步推测Paleodictyon形成于与浊流有关的深湖’半深湖环境，这一认识丰富了Paleodictyon遗迹化石的环境意义。

Discovery and Significance of Paleodictyon of Paleogene in Dongying Sag

The trace fossil Paleodictyon characterized by high abundance and low distinctness was discovered in Shahejie formation of Paleogene in Chunliang area of Dongying sag. Observation indicates that Paleodictyon in lacustrine environment has much smaller the string width and the mesh diameter than that in marine environment, and tends to being irregular in mesh pattern. The fabric analysis suggests that the Paleodictyon should be formed in deeplake-hemilake environment concerning with the turbidity current. This conclusion enriches and perfects the environmental significance of Paleodictyon.