Ediacaran Fronds from South Australia and Newfoundland
The Ediacara biota (575-539 Ma) represents a seminal event in the evolution of life, the first abundant appearance of large, architecturally complex, soft-bodied organisms after three billion years of mostly microbial evolution. Fronds occupied all tiers of the Ediacaran ecosystem and were the first...
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ftqueensuniv:oai:https://qspace.library.queensu.ca:1974/28783 2024-06-02T08:10:43+00:00 Ediacaran Fronds from South Australia and Newfoundland Grimes, Kelsey Geological Sciences and Geological Engineering Narbonne, Guy 2021-04-23T20:05:34Z application/pdf http://hdl.handle.net/1974/28783 eng eng Canadian theses http://hdl.handle.net/1974/28783 Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. Attribution-NonCommercial-NoDerivs 3.0 United States http://creativecommons.org/licenses/by-nc-nd/3.0/us/ Ediacaran Paleontology Geology Fronds thesis 2021 ftqueensuniv 2024-05-06T10:47:32Z The Ediacara biota (575-539 Ma) represents a seminal event in the evolution of life, the first abundant appearance of large, architecturally complex, soft-bodied organisms after three billion years of mostly microbial evolution. Fronds occupied all tiers of the Ediacaran ecosystem and were the first animals with a construction allowing them to partition the water column macroscopically resulting in a tiering ecosystem similar to Phanerozoic marine ecosystems in structure. Elongate fronds were a rarity in the Ediacaran, one in particular, formally named Rangea longa, was defined in 1966 but has not been studied in detail since. The specimens of this elongate frond are disparate in appearance, which have resulted in their exclusion from global syntheses and assigned to five different genera since its formal designation. The specimens of the Mincham-Flounders collection constitute one species with four taphonomic variants that illustrate the 3D structure of this frond. Akrophyllas longa is an elongate rangeomorph bifoliate frond attached to a bulbous holdfast either directly or with a short stem. The primary branches consistently appear sigmoidal in shape with rectangular secondary branches oriented perpendicular to the primaries. These fronds can be assigned to the Rangeomorpha, an extinct clade near the base of animal evolution, but exhibit an architecture and a construction that differs significantly from all other rangeomorph genera yet described and are herein formally designated as a new genus. Frond dusters, small fronds never reaching more than 8 cm in height as adults, occur commonly in the Ediacaran of Avalonian Newfoundland but have not been extensively described. A new frond duster is described and named here that displays unique architecture, otherwise unknown from the Ediacaran biota and easily distinguished from all Ediacaran macrofossils, justifying its erection as a new genus and species. This frond is a spatulate, feather-like frond with primary branches emerging from a single point at the base of ... Thesis Newfoundland Queen's University, Ontario: QSpace Holdfast ENVELOPE(-66.590,-66.590,-66.803,-66.803) |
institution |
Open Polar |
collection |
Queen's University, Ontario: QSpace |
op_collection_id |
ftqueensuniv |
language |
English |
topic |
Ediacaran Paleontology Geology Fronds |
spellingShingle |
Ediacaran Paleontology Geology Fronds Grimes, Kelsey Ediacaran Fronds from South Australia and Newfoundland |
topic_facet |
Ediacaran Paleontology Geology Fronds |
description |
The Ediacara biota (575-539 Ma) represents a seminal event in the evolution of life, the first abundant appearance of large, architecturally complex, soft-bodied organisms after three billion years of mostly microbial evolution. Fronds occupied all tiers of the Ediacaran ecosystem and were the first animals with a construction allowing them to partition the water column macroscopically resulting in a tiering ecosystem similar to Phanerozoic marine ecosystems in structure. Elongate fronds were a rarity in the Ediacaran, one in particular, formally named Rangea longa, was defined in 1966 but has not been studied in detail since. The specimens of this elongate frond are disparate in appearance, which have resulted in their exclusion from global syntheses and assigned to five different genera since its formal designation. The specimens of the Mincham-Flounders collection constitute one species with four taphonomic variants that illustrate the 3D structure of this frond. Akrophyllas longa is an elongate rangeomorph bifoliate frond attached to a bulbous holdfast either directly or with a short stem. The primary branches consistently appear sigmoidal in shape with rectangular secondary branches oriented perpendicular to the primaries. These fronds can be assigned to the Rangeomorpha, an extinct clade near the base of animal evolution, but exhibit an architecture and a construction that differs significantly from all other rangeomorph genera yet described and are herein formally designated as a new genus. Frond dusters, small fronds never reaching more than 8 cm in height as adults, occur commonly in the Ediacaran of Avalonian Newfoundland but have not been extensively described. A new frond duster is described and named here that displays unique architecture, otherwise unknown from the Ediacaran biota and easily distinguished from all Ediacaran macrofossils, justifying its erection as a new genus and species. This frond is a spatulate, feather-like frond with primary branches emerging from a single point at the base of ... |
author2 |
Geological Sciences and Geological Engineering Narbonne, Guy |
format |
Thesis |
author |
Grimes, Kelsey |
author_facet |
Grimes, Kelsey |
author_sort |
Grimes, Kelsey |
title |
Ediacaran Fronds from South Australia and Newfoundland |
title_short |
Ediacaran Fronds from South Australia and Newfoundland |
title_full |
Ediacaran Fronds from South Australia and Newfoundland |
title_fullStr |
Ediacaran Fronds from South Australia and Newfoundland |
title_full_unstemmed |
Ediacaran Fronds from South Australia and Newfoundland |
title_sort |
ediacaran fronds from south australia and newfoundland |
publishDate |
2021 |
url |
http://hdl.handle.net/1974/28783 |
long_lat |
ENVELOPE(-66.590,-66.590,-66.803,-66.803) |
geographic |
Holdfast |
geographic_facet |
Holdfast |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
Canadian theses http://hdl.handle.net/1974/28783 |
op_rights |
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. Attribution-NonCommercial-NoDerivs 3.0 United States http://creativecommons.org/licenses/by-nc-nd/3.0/us/ |
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1800756620450332672 |