Search Results - "Penny, Amelia M."
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BioDeepTime: A database of biodiversity time series for modern and fossil assemblages
Published in Global ecology and biogeography (01-10-2023)“…Abstract Motivation We have little understanding of how communities respond to varying magnitudes and rates of environmental perturbations across temporal…”
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Uranium isotope evidence for an expansion of anoxia in terminal Ediacaran oceans
Published in Earth and planetary science letters (15-01-2019)“…Anoxic and iron-rich oceanic conditions prevailed throughout most of the Archean and Proterozoic (4000 to c.540 million years ago, Ma), but the oceans are…”
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Constraints on the late Ediacaran sulfur cycle from carbonate associated sulfate
Published in Precambrian research (01-03-2017)“…•Inadequate pre-leaching procedures can affect average δ34SCAS by up to 12‰.•Enigmatic ‘superheavy’ pyrite may not be as prevalent as previously…”
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Calcium isotopes as a record of the marine calcium cycle versus carbonate diagenesis during the late Ediacaran
Published in Chemical geology (20-12-2019)“…•δ44Ca from limestones aged ∼550–539 Ma that host the earliest skeletal animal fossils.•Negative shift in δ44Ca that lasted at least 11–14Myrs.•Unlikely to…”
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