Archean molecular fossils and the early rise of eukaryotes.

  title={Archean molecular fossils and the early rise of eukaryotes.},
  author={Jochen J. Brocks and Graham A. Logan and Roger Buick and Roger Everett Summons},
  volume={285 5430},
Molecular fossils of biological lipids are preserved in 2700-million-year-old shales from the Pilbara Craton, Australia. Sequential extraction of adjacent samples shows that these hydrocarbon biomarkers are indigenous and syngenetic to the Archean shales, greatly extending the known geological range of such molecules. The presence of abundant 2alpha-methylhopanes, which are characteristic of cyanobacteria, indicates that oxygenic photosynthesis evolved well before the atmosphere became… 
Archean microfossils: a reappraisal of early life on Earth.
TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans
Biomarker molecular fossils in 2770 Ma shales suggest that the Eucarya diverged from other principal domains early in Earth history. Nonetheless, at present, the oldest fossils that can be assigned
A New Molecular Window on Early Life
Chemical evidence for biomolecules from the previous 1700 million years to 2700 million years is extended, by identifying biomarkers characteristic for cyanobacteria and eukaryotes in Archean rocks from rocks from Western Australia, and it is shown that a key attribute of eUKaryotic physiology had already evolved 27000 million years ago.
Archean tufted microbial mats and the Great Oxidation Event: new insights into an ancient problem
The macroscopic fossil record of the Archean consists solely of stromatolites and other microbialites, which seldom offer compelling clues to the identities of the organisms that formed them. Tufted
Recognizing and Interpreting the Fossils of Early Eukaryotes
Recognition of eukaryotic fossils in Proterozoic rocks is key to the integration of geological and comparative biological perspectives on protistan evolution.
11 History of Life from the Hydrocarbon Fossil Record
Certain lipids and biopolymers retain their original structure through sedimentary diagenesis and catagenesis that they can be assigned to a specific biological origin. These ‘‘taxon-specific
Paleobiological perspectives on early eukaryotic evolution.
  • A. Knoll
  • Geography, Biology
    Cold Spring Harbor perspectives in biology
  • 2014
Protists continued to diversify along with animals in the more pervasively oxygenated oceans of the Phanerozoic Eon, and the Mid-Neoproterozoic establishment or expansion of eukaryophagy provides a possible mechanism for accelerating eUKaryotic diversification long after the origin of the domain.
The paleobiological record of photosynthesis
Fossil evidence of photosynthesis, documented in Precambrian sediments by microbially laminated stromatolites, cyanobacterial microscopic fossils, and carbon isotopic data consistent with the
The paleobiological record of photosynthesis.
Fossil evidence of photosynthesis, documented in Precambrian sediments by microbially laminated stromatolites, cyanobacterial microscopic fossils, and carbon isotopic data consistent with the


Microfossils of the Early Archean Apex Chert: New Evidence of the Antiquity of Life
It is established that trichomic cyanobacterium-like microorganisms were extant and morphologically diverse at least as early as ∼3465 million years ago and suggests that oxygen-producing photoautotrophy may have already evolved by this early stage in biotic history.
Megascopic eukaryotic algae from the 2.1-billion-year-old negaunee iron-formation, Michigan.
Hundreds of specimens of spirally coiled, megascopic, carbonaceous fossils resembling Grypania spiralis (Walcott), have been found in the 2.1-billion-year-old Negaunee Iron-Formation at the Empire Mine, near Marquette, Michigan, placing the origin of organelle-bearing eukaryotic cells prior to 2.
Early Archean (3.3-billion to 3.5-billion-year-old) microfossils from Warrawoona Group, Australia.
Cellularly preserved filamentous and colonial fossil microorganisms have been discovered in bedded carbonaceous cherts from the Early Archean Apex Basalt and Towers Formation of northwestern Western
Terminal Proterozoic reorganization of biogeochemical cycles
It is shown that hydrocarbons extracted from Proterozoic sediments in several locations worldwide are derived mainly from bacteria or other heterotrophs rather than from photosyn-thetic organisms, and that preservation of algal-lipid skeletons improves at the beginning of the Cambrian, reflecting the increase in transport by rapidly sinking faecal pellets.
Evidence for life on Earth before 3,800 million years ago
IT is unknown when life first appeared on Earth. The earliest known microfossils (˜3,500 Myr before present) are structurally complex, and if it is assumed that the associated organisms required a
Early life on earth
This study is organized around three themes: the origin and early diversification of life during the Archean Eon; the maturation of life and the Earth during the long Proterozoic Eon; and the