Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland
Rangeomorphs, an extinct group of Ediacaran organisms with a fractal architecture and modular construction, occur abundantly in the Mistaken Point assemblage (575–560 Ma) of the Avalon Peninsula of Newfoundland. Bradgatia is represented by hundreds of specimens, collectively permitting analysis of i...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/e08-057 2024-06-23T07:54:44+00:00 Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland Flude, Lija I. Narbonne, Guy M. Jin, J. 2008 http://dx.doi.org/10.1139/e08-057 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-057 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-057 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 10, page 1095-1109 ISSN 0008-4077 1480-3313 journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-057 2024-06-13T04:10:50Z Rangeomorphs, an extinct group of Ediacaran organisms with a fractal architecture and modular construction, occur abundantly in the Mistaken Point assemblage (575–560 Ma) of the Avalon Peninsula of Newfoundland. Bradgatia is represented by hundreds of specimens, collectively permitting analysis of its morphology, growth mode, and life habits. Bradgatia is a petalage that consists of a radial array of up to eight petals, each exhibiting up to four visible orders of rangeomorph branching. The taphonomy and ontogeny of Bradgatia are tightly linked by a change in preserved morphology, from juvenile I- to V-shaped specimens to larger U-shaped specimens, to the largest and ontogenetically oldest O-shaped specimens. Bradgatia probably maintained a constant number of petals that gradually spread out with age. The number of frondlets per petal does not correlate with length, suggesting either fractal or inflationary growth. Presence of a structure from which petals branch, abundance of contour-parallel specimens, differential preservation within specimens, and specimens overlying spindles and discs all imply that Bradgatia had an attached, epifaunal, suspension-feeding lifestyle. Bradgatia's multiple thin petals would have helped to filter water more efficiently, while its lack of a stem would have allowed for suspension feeding along the entire length of each petal. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Mistaken Point ENVELOPE(-55.774,-55.774,53.478,53.478) Canadian Journal of Earth Sciences 45 10 1095 1109 |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Rangeomorphs, an extinct group of Ediacaran organisms with a fractal architecture and modular construction, occur abundantly in the Mistaken Point assemblage (575–560 Ma) of the Avalon Peninsula of Newfoundland. Bradgatia is represented by hundreds of specimens, collectively permitting analysis of its morphology, growth mode, and life habits. Bradgatia is a petalage that consists of a radial array of up to eight petals, each exhibiting up to four visible orders of rangeomorph branching. The taphonomy and ontogeny of Bradgatia are tightly linked by a change in preserved morphology, from juvenile I- to V-shaped specimens to larger U-shaped specimens, to the largest and ontogenetically oldest O-shaped specimens. Bradgatia probably maintained a constant number of petals that gradually spread out with age. The number of frondlets per petal does not correlate with length, suggesting either fractal or inflationary growth. Presence of a structure from which petals branch, abundance of contour-parallel specimens, differential preservation within specimens, and specimens overlying spindles and discs all imply that Bradgatia had an attached, epifaunal, suspension-feeding lifestyle. Bradgatia's multiple thin petals would have helped to filter water more efficiently, while its lack of a stem would have allowed for suspension feeding along the entire length of each petal. |
author2 |
Jin, J. |
format |
Article in Journal/Newspaper |
author |
Flude, Lija I. Narbonne, Guy M. |
spellingShingle |
Flude, Lija I. Narbonne, Guy M. Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland |
author_facet |
Flude, Lija I. Narbonne, Guy M. |
author_sort |
Flude, Lija I. |
title |
Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland |
title_short |
Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland |
title_full |
Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland |
title_fullStr |
Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland |
title_full_unstemmed |
Taphonomy and ontogeny of a multibranched Ediacaran fossil: Bradgatia from the Avalon Peninsula of Newfoundland |
title_sort |
taphonomy and ontogeny of a multibranched ediacaran fossil: bradgatia from the avalon peninsula of newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-057 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-057 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-057 |
long_lat |
ENVELOPE(-55.774,-55.774,53.478,53.478) |
geographic |
Mistaken Point |
geographic_facet |
Mistaken Point |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 10, page 1095-1109 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-057 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
10 |
container_start_page |
1095 |
op_container_end_page |
1109 |
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1802647001301516288 |