Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina
Fossil material assigned to Nenoxites from the late Ediacaran Khatyspyt Formation of Arctic Siberia (550–544 Ma) has been presented as evidence for bioturbation prior to the basal Cambrian boundary. However, that ichnological interpretation has been challenged, and descriptions of similar material f...
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ftubristolcris:oai:research-information.bris.ac.uk:publications/bcbc8e19-440b-4461-a374-7d7dcc48cca7 2023-08-27T04:07:58+02:00 Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina Psarras, Christos Donoghue, Philip C J Garwood, Russell J. Grazhdankin, Dmitriy V. Parry, Luke A Rogov, Vladimir Liu, Alexander G. 2023-08-01 https://hdl.handle.net/1983/bcbc8e19-440b-4461-a374-7d7dcc48cca7 https://research-information.bris.ac.uk/en/publications/bcbc8e19-440b-4461-a374-7d7dcc48cca7 eng eng info:eu-repo/semantics/embargoedAccess Psarras , C , Donoghue , P C J , Garwood , R J , Grazhdankin , D V , Parry , L A , Rogov , V & Liu , A G 2023 , ' Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina ' , Papers in Palaeontology . article 2023 ftubristolcris 2023-08-03T22:31:15Z Fossil material assigned to Nenoxites from the late Ediacaran Khatyspyt Formation of Arctic Siberia (550–544 Ma) has been presented as evidence for bioturbation prior to the basal Cambrian boundary. However, that ichnological interpretation has been challenged, and descriptions of similar material from other global localities support a body fossil origin. Here we combine X-ray computed tomography (μCT), scanning electron microscopy (SEM), and petrographic methods to evaluate the body- or trace-fossil nature of Nenoxites from the Khatyspyt Formation. The fossilised structures comprise densely-packed chains of three-dimensionally preserved silicic, bowl-shaped elements surrounded by distinct sedimentary halos, within a dolomitized matrix. Individual bowl-shaped elements can exhibit diffuse mineralogical boundaries and threadbridging-like connections between elements, both considered here to result from silicification and dolomitization during diagenesis. This new morphological and petrological evidence, in conjunction with recent studies of the late Ediacaran tubular taxaon Ordinilunulatus and Shaanxilithes from China, leads us to conclude that the Khatyspyt specimens most likely reflect a coquina deposit of Shaanxilithes-like body fossils. Our data support the possibility of Shaanxilithes-like organisms representing total group eumetazoans. Article in Journal/Newspaper Arctic Siberia University of Bristol: Bristol Research Arctic |
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Open Polar |
collection |
University of Bristol: Bristol Research |
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ftubristolcris |
language |
English |
description |
Fossil material assigned to Nenoxites from the late Ediacaran Khatyspyt Formation of Arctic Siberia (550–544 Ma) has been presented as evidence for bioturbation prior to the basal Cambrian boundary. However, that ichnological interpretation has been challenged, and descriptions of similar material from other global localities support a body fossil origin. Here we combine X-ray computed tomography (μCT), scanning electron microscopy (SEM), and petrographic methods to evaluate the body- or trace-fossil nature of Nenoxites from the Khatyspyt Formation. The fossilised structures comprise densely-packed chains of three-dimensionally preserved silicic, bowl-shaped elements surrounded by distinct sedimentary halos, within a dolomitized matrix. Individual bowl-shaped elements can exhibit diffuse mineralogical boundaries and threadbridging-like connections between elements, both considered here to result from silicification and dolomitization during diagenesis. This new morphological and petrological evidence, in conjunction with recent studies of the late Ediacaran tubular taxaon Ordinilunulatus and Shaanxilithes from China, leads us to conclude that the Khatyspyt specimens most likely reflect a coquina deposit of Shaanxilithes-like body fossils. Our data support the possibility of Shaanxilithes-like organisms representing total group eumetazoans. |
format |
Article in Journal/Newspaper |
author |
Psarras, Christos Donoghue, Philip C J Garwood, Russell J. Grazhdankin, Dmitriy V. Parry, Luke A Rogov, Vladimir Liu, Alexander G. |
spellingShingle |
Psarras, Christos Donoghue, Philip C J Garwood, Russell J. Grazhdankin, Dmitriy V. Parry, Luke A Rogov, Vladimir Liu, Alexander G. Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
author_facet |
Psarras, Christos Donoghue, Philip C J Garwood, Russell J. Grazhdankin, Dmitriy V. Parry, Luke A Rogov, Vladimir Liu, Alexander G. |
author_sort |
Psarras, Christos |
title |
Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
title_short |
Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
title_full |
Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
title_fullStr |
Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
title_full_unstemmed |
Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
title_sort |
three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina |
publishDate |
2023 |
url |
https://hdl.handle.net/1983/bcbc8e19-440b-4461-a374-7d7dcc48cca7 https://research-information.bris.ac.uk/en/publications/bcbc8e19-440b-4461-a374-7d7dcc48cca7 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Siberia |
genre_facet |
Arctic Siberia |
op_source |
Psarras , C , Donoghue , P C J , Garwood , R J , Grazhdankin , D V , Parry , L A , Rogov , V & Liu , A G 2023 , ' Three-dimensional reconstruction, taphonomic and petrological data suggest the oldest record of bioturbation is a body fossil coquina ' , Papers in Palaeontology . |
op_rights |
info:eu-repo/semantics/embargoedAccess |
_version_ |
1775348685786316800 |