Menu

Life Before 4 Billion Years Ago?

A new estimate of the origin of life on Earth pushes back the date by 300 million years.

Oct 20, 2015
Jef Akst

FLICKR, BETH SCHUPHAMThe Earth formed approximately 4.6 billion years ago. And according to new research, life may have followed just a half a billion years later—300 million years earlier than previous estimates of life’s origins.

Mark Harrison of the University of California, Los Angeles, and his colleagues have suggested this new date based on bits of graphite, a crystalline form of carbon, which they discovered in zircon crystals from Jack Hills, Western Australia. The atoms within the graphite were enriched with 12C, giving the material a carbon isotope–ratio normally associated with living things. Harrison’s team published its results yesterday (October 20) in PNAS, arguing that they may suggest a terrestrial biosphere emerged on Earth as early as 4.1 billion years ago.

“This study extends the terrestrial carbon isotope record around 300m years beyond the previously oldest-measured samples from south-west Greenland,” the authors wrote in their paper. “A biogenic origin seems at least as plausible,” though they added that meteorite impacts and other nonbiological processes could have produced the 12C. Indeed, this is not the first time researchers have claimed to have discovered organic carbon in zircon crystals, and on previous occasions the carbon was found to be an artifact of preparation techniques, Harrison told New Scientist. “I think there will be little dispute regarding the primary nature of the inclusions.”

But the new work is certainly intriguing, the University of Colorado, Boulder’s Steve Mojzsis, who was not involved in the study, told New Scientist. “Harrison and his team have challenged us now to think deeply about just how ancient the biosphere could be and to find new ways to explore for a cryptic record of it.”

(Hat tip: The Guardian)

July 2019

On Target

Researchers strive to make individualized medicine a reality

Marketplace

Sponsored Product Updates

DNASTAR® announced the release of Lasergene 16 Software
DNASTAR® announced the release of Lasergene 16 Software
DNASTAR® announced the release of Lasergene 16 today, which includes a broad range of improvements in for analysis of DNA, RNA and protein sequence data, as well as new advancements for predicting and analyzing protein structures. 
Arbor Biosciences Partners with Curio Genomics for Analysis of IWGSC Wheat Exome
Arbor Biosciences Partners with Curio Genomics for Analysis of IWGSC Wheat Exome
Arbor Biosciences, a division of Chiral Technologies, Inc and worldwide leader in next generation sequencing (NGS) target enrichment, announces a partnership with Curio Genomics for bioinformatics analysis of the wheat genome.
IDT and Washington University join forces to increase access to the latest NGS technologies
IDT and Washington University join forces to increase access to the latest NGS technologies
As part of its commitment to advocate for the genomics age, Integrated DNA Technologies (IDT) aims to lower the barriers to access the latest NGS technologies.
Bio-Rad Launches Bio-Plex Pro Human Immunotherapy Panel 20-plex Multiplex Assay, a targeted tool for researching signaling networks in Immunotherapy Research
Bio-Rad Launches Bio-Plex Pro Human Immunotherapy Panel 20-plex Multiplex Assay, a targeted tool for researching signaling networks in Immunotherapy Research
Bio-Rad Laboratories, Inc. (NYSE: BIO and BIOb) July 15, 2019 announced the launch of its Bio-Plex Pro Human Immunotherapy Panel 20-plex, a multiplex immunoassay that offers a targeted approach for Immunotherapy Research.