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Ichnological evidence of marine incursions in the lacustrine–palustrine Bembridge Limestone Formation (Eocene), Isle of Wight, southern England
Proceedings of the Geologists' Association ( IF 1.2 ) Pub Date : 2023-02-22 , DOI: 10.1016/j.pgeola.2022.11.003
Dirk Knaust

Trace fossils are described from the Eocene Bembridge Limestone Formation from the Isle of Wight and used to constrain the paleoenvironmental interpretation. The lacustrine–palustrine succession contains three limestone beds, which are separated by clay and marl. The middle and upper limestone beds reveal complex burrow systems developed at their top. Based on their characteristics, these burrow systems are assigned to the ichnotaxon Balanoglossites triadicus Mägdefrau, which is associated with the shallow superficial grooves Sulcolithos variabilis Knaust. B. triadicus is a common marine trace fossil mainly known from shallow-marine carbonate successions throughout the Phanerozoic. It is accompanied by other marine ichnotaxa such as Arachnostega gastrochaenae Bertling, Gastrochaenolites isp. aff. G. ornatus Kelly and Bromley, Spongeliomorpha iberica Saporta and Thalassinoides suevicus (Rieth). This ichnological evidence confirms the occurrence of short-term marginal-marine incursions in a predominantly lacustrine to palustrine environment.



中文翻译:

英格兰南部怀特岛湖泊-沼泽本布里奇石灰岩组(始新世)海洋入侵的地质学证据

从怀特岛的始新世本布里奇石灰岩地层中描述了痕迹化石,并用于限制古环境解释。湖泊-沼泽层序包含三个石灰岩层,它们被粘土和泥灰岩隔开。中上层石灰岩层揭示了在其顶部发育的复杂洞穴系统。根据它们的特征,这些洞穴系统被分配给 ichnotaxon Balanoglossites triadicus Mägdefrau,它与浅表层沟槽Sulcolithos variabilis Knaust相关B. triadicus是一种常见的海洋痕迹化石,主要从整个显生宙的浅海碳酸盐岩层序中得知。它与其他海洋鱼类一起出现,例如Arachnostega gastrochaenae Bertling,Gastrochaenolites isp。阿夫。G. ornatus Kelly 和 Bromley、Spongeliomorpha iberica Saporta 和Thalassinoides suevicus (Rieth)。这一生态学证据证实了在以湖泊到沼泽为主的环境中发生了短期边缘海洋入侵。

更新日期:2023-02-22
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