The DOI matches its Crossref record; 29 of the 29 references it cites were found in a registry or an index.
Dodging snowballs: Geochronology of the Gaskiers glaciation and the first appearance of the Ediacaran biota
Abstract
The snowball Earth hypothesis predicts that low-latitude glaciation lasted millions of years while CO2 built up to critical levels to culminate in catastrophic deglaciation in a supergreenhouse climate. The Gaskiers Formation of eastern Newfoundland (Canada) has been attributed to a snowball glaciation event, but the lack of robust paleomagnetic data and precise geochronological constraints has precluded tests of the hypothesis. Here we present high-precision U-Pb zircon geochronology (chemical abrasion–isotope dilution–thermal ionization mass spectrometry) from eight tuffs from multiple distant stratigraphic sections that bracket glacial diamictites and the first appearance of large Ediacaran fossils. Including internal error, deposition of the Gaskiers diamictite on the Avalon Peninsula is constrained to have been between 580.90 ± 0.40 and 579.88 ± 0.44 Ma, and the Trinity diamictite on Bonavista Peninsula was deposited between 579.63 ± 0.15 and 579.24 ± 0.17 Ma. Assuming approximately synchronous deglaciation, these results imply a maximum duration for deposition of the Trinity diamictite of ≤340 k.y.; this is inconsistent with the multimillion year duration predicted by the snowball Earth hypothesis. Our geochronologic data also constrain the first appearance datum of Ediacaran fossils to <9.5 m.y. after the Gaskiers glaciation. Thus, despite existing paleomagnetic constraints that indicate that marine ice sheets extended to low to middle latitudes, it appears that Earth…
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“This event, however, is nested within a far more ancient record of macrofossils extending at least into the late Ediacaran, ~571 Ma.”
From Integrated records of environmental change and evolution challenge the Cambrian Explosion (2019) · cites this paper as [52]
In the citing paper
“The oldest macrofossils of the so-called 'Ediacaran macrobiota' are known from the Drook Formation, Newfoundland (52), and are dated at ~571 Ma (53).”
From Integrated records of environmental change and evolution challenge the Cambrian Explosion (2019) · cites this paper as [52]
Citations
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Snowball Earth climate dynamics and Cryogenian geology-geobiology
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Integrated records of environmental change and evolution challenge the Cambrian Explosion
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Metadata
- Authors
- Pu, J. P., Bowring, S. A., Ramezani, J., Myrow, P., Raub, T. D., Landing, E., Mills, A., Hodgin, E., & Macdonald, F. A.
- Affiliations
- Harvard University (US)
- Massachusetts Institute of Technology (US)
- Colorado College (US)
- University of St Andrews (GB)
- New York State Museum (US)
- Geological Survey of Newfoundland and Labrador (CA)
- ORCID
- Venue
- Geology
- Publisher
- Geological Society of America
- Published
- 2016-11-01
- Volume
- 44
- Issue
- 11
- Pages
- 955-958
- ISSN
- 0091-7613 (ISSN-L)
- 1943-2682
- OpenAlex
- W2526226930
- Cited by
- 357
- References
- 29
- Citations by year
- 2026: 23 · 2025: 41 · 2024: 43 · 2023: 38 · 2022: 34 · 2021: 37 · 2020: 51 · 2019: 24 · 2018: 44 · 2017: 20 · 2016: 2
- FWCI
- 24.99
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Geology (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Keywords
- Snowball Earth, Gaskiers glaciation, Ediacaran biota, zircon U-Pb geochronology, glacial diamictites, tuff, deglaciation chronology, first appearance datum, Neoproterozoic glaciation, Avalon Peninsula, animal evolution
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