Abstract
En Siberia los morfotipos de Cloudina han sido tradicionalmente considerados como una variedad tafonómica de conchas de Anabarites, insertadas una dentro de otra, bajo condiciones hidrodinámicas específicas. Las asociaciones de conchas cónicas telescópicas son omnipresentes en el Grupode Kessyusa y en estratos contemporáneos a lo largo de Siberia, y no todos ellos pueden ser fácilmente interpretados como resultado de un simple apilamiento mecánico. Queda por ver si alguna de estas bioacumulaciones representa una asociación de vida de una estructura morfotípica de tipo Cloudina.
Highlights
Representatives of the fossil genus Cloudina, a potential terminal Ediacaran index-taxon, are preserved in the form of conico-tubular calcareous structure built of numerous nested funnel-shaped elements, with concentrically placed circular to ellipsoid layers in cross section
The Ediacaran strata contain the youngest assemblage of Ediacaran Avalon-type macrofossils preserved as mouldic imprints in Recibido el 2 de mayo de 2019; Aceptado el 1 de julio de 2019; Publicado online el 21 de noviembre de 2019
Cloudina-morph fossils in Siberia have always been interpreted as a taphonomic mode of Anabarites tests inserted one into another under specific hydrodynamic conditions
Summary
Representatives of the fossil genus Cloudina, a potential terminal Ediacaran index-taxon, are preserved in the form of conico-tubular calcareous structure built of numerous nested funnel-shaped elements, with concentrically placed circular to ellipsoid layers in cross section. It is one of the most geographically widespread and numerically abundant fossil in uppermost Ediacaran strata; the paucity of this taxon in Siberia has been puzzling (Zhuravlev et al, 2012; Grazhdankin et al, 2015). Fragments of conicotubular calcareous moulds found throughout the Turkut Formation and predating the lowest occurrence of fossil anabaritids in the section have been traditionally regarded as poorly preserved fossils of Cambrotubulus decurvatus (Nagovitsin et al, 2015)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
