New and Ancient Trace Makers

Bengtson, Stefan; Rasmussen, Birger

doi:10.1126/science.1168794

Cited by 20 publications

(7 citation statements)

References 10 publications

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“…In a recent study, Matz et al (2008) demonstrated that the ridged traces could have been made by giant protist testate amoebaGromia. Bengtson and Rasmussen (2009) also agree with this interpretation. Distinct eukaryotic remains have not been found in Palaeoproterozoic sediments, however geochemical analysis of bitumen found in the McArthur Group in northern Australia (1700 Ma) shows the presence of steranes (Summons and Walter 1990) -a derivative of sterols -produced chiefl y by eukaryotes (Ourisson et al 1987).…”

Section: Proterozoic Fossil Recordsupporting

confidence: 86%

The evolution and distribution of life in the Precambrian eon-Global perspective and the Indian record

Шарма¹,

Shukla²

2009

J Biosci

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The discovery of Precambrian microfossils in 1954 opened a new vista of investigations in the field of evolution of life. Although the Precambrian encompasses 87% of the earth's history, the pace of organismal evolution was quite slow. The life forms as categorised today in the three principal domains viz. the Bacteria, the Archaea and the Eucarya evolved during this period. In this paper, we review the advancements made in the Precambrian palaeontology and its contribution in understanding the evolution of life forms on earth. These studies have enriched the data base on the Precambrian life. Most of the direct evidence includes fossil prokaryotes, protists, advanced algal fossils, acritarchs, and the indirect evidence is represented by the stromatolites, trace fossils and geochemical fossils signatures. The Precambrian fossils are preserved in the form of compressions, impressions, and permineralized and biomineralized remains.

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Section: Proterozoic Fossil Recordsupporting

confidence: 86%

The evolution and distribution of life in the Precambrian eon-Global perspective and the Indian record

Шарма¹,

Shukla²

2009

J Biosci

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“…In some cases these results have suggested considerable extension of known stratigraphic ranges (Carrano and Wilson 2001;Niedzwiedzki et al 2009). The most controversial topic in this area is identification of Precambrian traces as dating the origin of mobile bilaterians (Bengtson and Rasmussen 2009).…”

Section: The Gulf Between Ichnology and Behavioralmentioning

confidence: 98%

Behavioral biology of trace fossils

Plotnick¹

2012

Paleobiology

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The potential of the ichnofossil record for exploring the evolution of behavior has never been fully realized. Some of this is due to the nature of the trace fossil record itself. Equally responsible is the separation of ichnology from the relevant areas of modern behavioral biology. The two disciplines have virtually no concepts, methods, or literature in common. The study of animal behavior and its evolution is thus bereft of the rich data and insights of ichnologists.One potential pathway forward is for ichnologists to adopt and adapt the movement ecology paradigm proposed several years ago by Ran Nathan and colleagues. This approach views movement as resulting from interactions of the organism's internal state, its movement abilities, and its sensory capabilities with each other and with the external environment. These interactions produce a movement path. The adoption of this paradigm would place trace fossil studies in a far wider common context for the study of movement, while providing the dimension of the evolution of movement behavior in deep time to neontological studies.A second component of this integration would be for paleontologists to develop ataphonomy of behaviorthat places in a phylogenetic context the range of possible behaviors that organisms can carry out and assesses the potential of each of these behaviors in leaving a diagnostic trace. Parallel to other taphonomic concepts, this approach assesses the preservation potential of particular behaviors;behavioral fidelityis the extent to which trace fossils preserve these original behavioral signals.

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“…Similarly, pyritized strong-shaped structures in shales from the Franceville Group (112) and U-shaped ridges in sandstones from the 2.0-1.8 Ga Stirling Range Formation, Australia, have been interpreted as the traces of macroscopic motile organisms (113), which were possibly unicellular (114). However, even the biogenicity of these structures is in question (e.g., 115,116).…”

Section: Implications For the Evolution Of Biological Complexitymentioning

confidence: 99%

Chromium evidence for protracted oxygenation during the Paleoproterozoic

Mänd¹,

Planavsky²,

Porter³

et al. 2021

Preprint

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It has commonly been proposed that the development of complex life-e.g., aerobic eukaryotes-coincided with atmospheric oxygenation. To test this hypothesis, we measured chromium-based oxygen proxies in a >2400-m core from the Onega Basin (NW-Russia), deposited ~2.1-2.0 billion years ago-closely preceding the first eukaryote fossils.Fractionated chromium isotopes are documented throughout the section (max. 1.63±0.10‰ δ 53 Cr), suggesting higher and more stable oxygen levels during this interval (possibly >100 million years) than persisted for much of the billion years before or after. Significantly, unambiguous eukaryotic fossils have not been found in the Onega Basin or any contemporaneous successions. While this does not discount an increase in biological complexity during this oxic interval, our study calls into question the causative correlation between oxygenation and biological innovation. This work further highlights that while oxygenation is a necessary precursor for diverse eukaryote rich ecosystems, it need not drive eukaryogenesis or diversification.

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New and Ancient Trace Makers

Cited by 20 publications

References 10 publications

The evolution and distribution of life in the Precambrian eon-Global perspective and the Indian record

The evolution and distribution of life in the Precambrian eon-Global perspective and the Indian record

Behavioral biology of trace fossils

Chromium evidence for protracted oxygenation during the Paleoproterozoic

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