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Late Precambrian Oxygenation; Inception of the Clay Mineral Factory
An enigmatic stepwise increase in oxygen in the late Precambrian is widely considered a prerequisite for the expansion of animal life. Accumulation of oxygen requires organic matter burial inExpand
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A new ecological-severity ranking of major Phanerozoic biodiversity crises
A new ecological-severity ranking of the major Phanerozoic biodiversity crises is proposed in which the Capitanian crisis is ranked lesser than the Frasnian (Late Devonian) but greater than theExpand
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Ecological ranking of Phanerozoic biodiversity crises: ecological and taxonomic severities are decoupled
Abstract The past two decades have seen extensive analyses of the taxonomic severity of major biodiversity crises in geologic time. In contrast, we propose here an alternative analysis of theExpand
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Assemblage palaeoecology of the Ediacara biota: The unabridged edition?
Fossils of the Ediacara biota offer our earliest insight into diverse macroscopic life on this planet. In particular, given the diversity and range of exquisite soft-bodied preservation, theExpand
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Protracted development of bioturbation through the early Palaeozoic Era
Mobile organisms first appeared in the fossil record prior to the Precambrian–Cambrian transition. Sediment textures indicate that the degree of sediment mixing by animal activity remained low forExpand
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Trace fossils and substrates of the terminal Proterozoic–Cambrian transition: Implications for the record of early bilaterians and sediment mixing
The trace fossil record is important in determining the timing of the appearance of bilaterian animals. A conservative estimate puts this time at ≈555 million years ago. The preservational potentialExpand
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Mineralogical constraints on the paleoenvironments of the Ediacaran Doushantuo Formation
Assemblages of clay minerals are routinely used as proxies for paleoclimatic change and paleoenvironmental conditions in Phanerozoic rocks. However, this tool is rarely applied in older sedimentaryExpand
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Ecological Signature of Lower Triassic Shell Beds of the Western United States
Abstract The end-Permian mass extinction was the largest Phanerozoic biotic crisis that resulted in significant and permanent ecological change. In order to examine ecological aspects of theExpand
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TAPHONOMIC CONTROLS ON EDIACARAN DIVERSITY: UNCOVERING THE HOLDFAST ORIGIN OF MORPHOLOGICALLY VARIABLE ENIGMATIC STRUCTURES
Abstract Earth's earliest known metazoan ecosystems are represented by a handful of globally distributed fossil assemblages, collectively referred to as the Ediacara Biota. Although a number of theseExpand
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Lowermost Cambrian Ichnofabrics from the Chapel Island Formation, Newfoundland: Implications for Cambrian Substrates
Abstract Bioturbation long has been ‘blamed’ for eliminating late Proterozoic-style sedimentary structures and fabrics. While the presence of diverse and complex burrows in lowermost Cambrian strataExpand
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