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The Proterozoic and Earliest Cambrian Trace Fossil Record; Patterns, Problems and Perspectives1
  • S. Jensen
  • Geology, Medicine
  • Integrative and comparative biology
  • 1 February 2003
Abstract The increase in trace fossil diversity across the Neoproterozoic-Cambrian boundary often is presented in terms of tabulations of ichnogenera. However, a clearer picture of the increase inExpand
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A critical reappraisal of the fossil record of the bilaterian phyla
  • G. Budd, S. Jensen
  • Medicine
  • Biological reviews of the Cambridge Philosophical…
  • 1 May 2000
It has long been assumed that the extant bilaterian phyla generally have their origin in the Cambrian explosion, when they appear in an essentially modern form. Both these assumptions areExpand
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Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland
The range of Treptichnus pedum, the index trace fossil for the Treptichnus pedum Zone, extends some 4 m below the Global Standard Stratotype-section and Point for the base of the Cambrian Period atExpand
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Ediacara-type fossils in Cambrian sediments
Fossil assemblages that preserve soft-bodied organisms are essential for our understanding of the composition and diversity of past life. The worldwide terminal Proterozoic Ediacara-type fossilsExpand
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Complex trace fossils from the terminal Proterozoic of Namibia
We document for the first time the occurrence of the complex trace fossil Treptichnus from the terminal Proterozoic Nama Group, Namibia. These traces differ in detail from the Cambrian index fossilExpand
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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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Trace fossils and biofabrics at the Precambrian-Cambrian boundary interval in western Mongolia
A small suite of trace fossils from the Zavkhan Basin (Govi-Altay) includes many of the ichnotaxa typical of the Nemakit-Daldynian, Tommotian and younger Cambrian stages, and other indeterminateExpand
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The origin of the animals and a ‘Savannah’ hypothesis for early bilaterian evolution
  • G. Budd, S. Jensen
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical…
  • 1 February 2017
The earliest evolution of the animals remains a taxing biological problem, as all extant clades are highly derived and the fossil record is not usually considered to be helpful. The rise of theExpand
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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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