Middle Cambrian Diplocraterion parallelum from North China: Ethologic significance and facies controls
首发时间:2017-05-05
Abstract:The middle Cambrian Mantou Formation of the Mianchi section of western Henan Province, North China provides an opportunity to address infaunal colonization during the aftermath of the Cambrian explosion. The trace fossil Diplocraterion is common within intertidal very fine-grained sandstone of the Member II of the Mantou Formation (Stage 5). Diplocraterion consists of perpendicular to bedding plane, lined U-shaped burrows with well-developed marginal tubes, having distinctive, dark and light colored, laminae forming retrusive and protrusive spreiten reflecting the activity of a suspension feeder. No scratches are observed on the wall of the marginal tubes. SEM-EDS mapping detection shows that the dark laminae are dominated by Si, Al and Fe, whereas the light laminae are dominated by Ca and Si. Based on ichnological, stratigraphical and SEM-EDS features, it is suggested that the specimens of Diplocraterion studied here results from the equilibrium behavior and that the delayed appearance of this ichnotaxon in North China is due to lack of appropriate siliciclastic facies.
keywords: Diplocraterion Cambrian Colonization North China Mianchi
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豫西渑池中寒武世双杯迹的古生态学意义
摘要:豫西渑池剖面中寒武世馒头组二段保存有大量的遗迹化石和微生物岩,为更好的了解寒武纪生物大爆发之后内生底栖生物的殖居趋势提供了良好的素材。本文在馒头组二段潮坪相极细砂岩中识别出保存良好的群居的Diplocraterion。Diplocraterion 主要形貌为垂直于层面的U形蹼状潜穴,蹼层分为浅色和深色小蹼纹,代表了前进式和后退式的悬浮性觅食迹。在边缘管上未见抓痕。环境扫描电镜和能谱分析指出深色小蹼纹主要成分Si, Al, Fe,而浅色小蹼纹主要成分为Ca, Si. 基于上述特征,华北地区推迟出现的Diplocraterion反映了均衡主义生物的行为习性,可能受到了沉积相的控制。
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No.4730535119793514****
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