Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada.
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| Title: | Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada. |
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| Authors: | McIlroy, D.1 dmcilroy@mun.ca, Denyszyn, S.1, Olschewski, P.1, Rosse-Guillevic, S.1, Muirhead-Hunt, H.1, Pérez-Pinedo, D.1, McKean, C.1, Pasinetti, G.1, Rideout, B.1, Steele, M. P.1, Menon, L. R.1, Neville, J. M.1, Chida, N.1, Taylor, R. S.1 |
| Source: | Geology. Apr2026, Vol. 54 Issue 4, p342-347. 6p. |
| Subject Terms: | *Ediacaran fossils, *Mass extinctions, *Marine biology, *Paleontological excavations, *Precambrian |
| Geographic Terms: | Canada, Newfoundland & Labrador |
| Abstract: | The Ediacaran biota has been informally divided into three ecostratigraphic units: the lowermost deep marine Avalon Assemblage, the overlying shallow-marine White Sea Assemblage, and the uppermost Nama Assemblage. While there are some shared taxa among all three, they have been considered relatively robust, informal, biostratigraphic entities. We document a rich new fossil site that includes most of the Avalon Assemblage biota from the EM Coombs Surface at Inner Meadow, Newfoundland, Canada, and date it to 550.78 ± 0.60 Ma, equivalent to the youngest White Sea Assemblage faunas. This demonstrates that the Avalon and White Sea assemblages are contemporaneous, that the differences between them are ecological, not stratigraphic, and that the Avalon Assemblage biotas were also affected by the 550 Ma Kotlin Crisis that has hitherto been considered to only affect the White Sea Assemblage. The impoverished post-extinction Nama Assemblage succeeds the Kotlin Crisis, which our data reveal to be more profound than previously known. The Kotlin Crisis is considered to be the first significant extinction event experienced by the Eumetazoa, ∼10 m.y. before the Cambrian radiation. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 192913036 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22McIlroy%2C+D%2E%22">McIlroy, D.</searchLink><relatesTo>1</relatesTo><i> dmcilroy@mun.ca</i><br /><searchLink fieldCode="AR" term="%22Denyszyn%2C+S%2E%22">Denyszyn, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Olschewski%2C+P%2E%22">Olschewski, P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rosse-Guillevic%2C+S%2E%22">Rosse-Guillevic, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Muirhead-Hunt%2C+H%2E%22">Muirhead-Hunt, H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pérez-Pinedo%2C+D%2E%22">Pérez-Pinedo, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22McKean%2C+C%2E%22">McKean, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pasinetti%2C+G%2E%22">Pasinetti, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rideout%2C+B%2E%22">Rideout, B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Steele%2C+M%2E+P%2E%22">Steele, M. P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Menon%2C+L%2E+R%2E%22">Menon, L. R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Neville%2C+J%2E+M%2E%22">Neville, J. M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chida%2C+N%2E%22">Chida, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Taylor%2C+R%2E+S%2E%22">Taylor, R. S.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geology%22">Geology</searchLink>. Apr2026, Vol. 54 Issue 4, p342-347. 6p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Ediacaran+fossils%22">Ediacaran fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Mass+extinctions%22">Mass extinctions</searchLink><br />*<searchLink fieldCode="DE" term="%22Marine+biology%22">Marine biology</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleontological+excavations%22">Paleontological excavations</searchLink><br />*<searchLink fieldCode="DE" term="%22Precambrian%22">Precambrian</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Canada%22">Canada</searchLink><br /><searchLink fieldCode="DE" term="%22Newfoundland+%26+Labrador%22">Newfoundland & Labrador</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Ediacaran biota has been informally divided into three ecostratigraphic units: the lowermost deep marine Avalon Assemblage, the overlying shallow-marine White Sea Assemblage, and the uppermost Nama Assemblage. While there are some shared taxa among all three, they have been considered relatively robust, informal, biostratigraphic entities. We document a rich new fossil site that includes most of the Avalon Assemblage biota from the EM Coombs Surface at Inner Meadow, Newfoundland, Canada, and date it to 550.78 ± 0.60 Ma, equivalent to the youngest White Sea Assemblage faunas. This demonstrates that the Avalon and White Sea assemblages are contemporaneous, that the differences between them are ecological, not stratigraphic, and that the Avalon Assemblage biotas were also affected by the 550 Ma Kotlin Crisis that has hitherto been considered to only affect the White Sea Assemblage. The impoverished post-extinction Nama Assemblage succeeds the Kotlin Crisis, which our data reveal to be more profound than previously known. The Kotlin Crisis is considered to be the first significant extinction event experienced by the Eumetazoa, ∼10 m.y. before the Cambrian radiation. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=192913036 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1130/G54217.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 342 Subjects: – SubjectFull: Ediacaran fossils Type: general – SubjectFull: Mass extinctions Type: general – SubjectFull: Marine biology Type: general – SubjectFull: Paleontological excavations Type: general – SubjectFull: Precambrian Type: general – SubjectFull: Canada Type: general – SubjectFull: Newfoundland & Labrador Type: general Titles: – TitleFull: Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: McIlroy, D. – PersonEntity: Name: NameFull: Denyszyn, S. – PersonEntity: Name: NameFull: Olschewski, P. – PersonEntity: Name: NameFull: Rosse-Guillevic, S. – PersonEntity: Name: NameFull: Muirhead-Hunt, H. – PersonEntity: Name: NameFull: Pérez-Pinedo, D. – PersonEntity: Name: NameFull: McKean, C. – PersonEntity: Name: NameFull: Pasinetti, G. – PersonEntity: Name: NameFull: Rideout, B. – PersonEntity: Name: NameFull: Steele, M. P. – PersonEntity: Name: NameFull: Menon, L. R. – PersonEntity: Name: NameFull: Neville, J. M. – PersonEntity: Name: NameFull: Chida, N. – PersonEntity: Name: NameFull: Taylor, R. S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00917613 Numbering: – Type: volume Value: 54 – Type: issue Value: 4 Titles: – TitleFull: Geology Type: main |
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