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Related Experiment Video

Updated: May 28, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside

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Assessing the Earliest Evidence for Life in the Geologic and Genomic Records.

Elizabeth A Bell¹, Gregory P Fournier²

¹Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, California, USA.

|May 27, 2026

Summary

This summary is machine-generated.

The geologic and genomic records suggest early life originated on Earth within its first billion years, supported by evidence of liquid water. Further research may uncover even earlier signs of life on our planet.

Keywords:

Archean—Hadean—Microfossil—Stromatolite—Molecular clock—LUCA

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Area of Science:

Astrobiology
Geology
Genomics
Paleontology

Background:

The earliest history of terrestrial life is investigated using both geologic and genomic data.
Fragmentary rock records and microfossils suggest life originated and diversified within Earth's first billion years.
Evidence for liquid water by 4.3 billion years ago indicates early habitability.

Purpose of the Study:

To synthesize geologic and genomic evidence for early life on Earth.
To understand the environment, physiology, and metabolism of early life forms.
To constrain the timing of the last universal common ancestor (LUCA) and the divergence of major life domains.

Main Methods:

Analysis of microfossil evidence and geochemical traces in ancient rock formations.
Genomic analysis, including ancestral proteome reconstruction and molecular clock methodologies.
Reconstruction of early Earth's environmental conditions, particularly the presence of liquid water.

Main Results:

Microfossils and traces suggest life originated and diversified within the first billion years of Earth's history.
Genomic data provides insights into early life's environment, physiology, and metabolism.
Ancestral proteome reconstruction and molecular clocks offer clues to LUCA's timing and nature, though with uncertainties.

Conclusions:

The combined geologic and genomic records support the early origin and diversification of life on Earth.
Further refinement of molecular clock methods and interrogation of geologic records are needed to better understand LUCA and the earliest evidence of life.