豫西济源谭庄组河流沉积中的Stipsellus遗迹组构
The Stipsellus ichnofabric in the fluvial deposits of Upper Triassic Tanzhuang Formation in Jiyuan, western Henan
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摘要: 豫西济源盆地上三叠统谭庄组下段为曲流河沉积。本文通过描述和分析谭庄组河流沉积特征,划分了 4种不同河流沉积组合类型,识别出Stipsellus遗迹组构,并发现该遗迹组构常与曲流河沉积物伴生,可作为此类沉积的典型生物遗迹标志。其中,Stipsellus sp. A代表发育在河漫滩较浅水体下或潮湿的软底细粒沉积物中的一种遗迹组构类型;Stipsellus sp. B则代表发育在曲流砂坝上部的另一种遗迹组构类型。Abstract: The lower member of Tanzhuang Formation (Upper Triassic) in Jiyuan Basin,western Henan is interpreted as the deposit in the high sinuosity fluvial plain.This paper particularly described and analyzed four assemblage types of fluvial deposits,and ascribed Stipsellus ichnofabric as a trace fossil feature of high sinuosity fluvial plain,in which Stipsellus sp.A ichnofabric occurs in floodplain,Stipsellus sp.B ichnofabric occurs in point bar.
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