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The Proterozoic and Earliest Cambrian Trace Fossil Record; Patterns, Problems and Perspectives1
- S. Jensen
- Geography, Environmental ScienceIntegrative and comparative biology
- 1 February 2003
A clearer picture of the increase in diversity and complexity can be reached by combining trace fossils into broad groups defined both on morphology and interpretation, which focuses attention on looking for similarites between Neoproterozoic and Cambrian trace fossils.
A critical reappraisal of the fossil record of the bilaterian phyla
It is shown that the prospect of lineage diversification occurring early in the Proterozoic can be seen to be unlikely on grounds of both parsimony and functional morphology, and this analysis points to the requirement for a careful application of systematic methodology before explanations are sought for alleged patterns of constraint and flexibility.
Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland
- J. Gehling, S. Jensen, M. Droser, P. Myrow, G. Narbonne
- Environmental Science, GeographyGeological Magazine
- 1 March 2001
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 at…
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 fossils…
A Critical Look at the Ediacaran Trace Fossil Record
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 fossil…
The origin of the animals and a ‘Savannah’ hypothesis for early bilaterian evolution
- G. Budd, S. Jensen
- Environmental Science, GeographyBiological reviews of the Cambridge Philosophical…
- 1 February 2017
The subtle remnants of Ediacara‐style taxa within the Cambrian suggest that they remained significant components of Phanerozoic communities, even though at some point their enabling role for bilaterian evolution was presumably taken over by bilaterians or other metazoans.
A new species of Cloudina from the terminal Ediacaran of Spain
Trace fossils and substrates of the terminal Proterozoic–Cambrian transition: Implications for the record of early bilaterians and sediment mixing
- M. Droser, S. Jensen, J. Gehling
- Environmental Science, GeographyProceedings of the National Academy of Sciences…
- 23 September 2002
These studies on earliest Cambrian sediments suggest that shallow tiers were preserved to a greater extent than typical for most of the Phanerozoic, which can be attributed both directly and indirectly to the low levels of sediment mixing.