Electron microscope methods in the search for the earliest life forms on Earth (in 3.5-3.3 GA cherts from the Barberton Greenstone Belt, South Africa): applications for extraterrestrial life studies

Details Electron microscope methods in the search for the earliest life forms on Earth (in 3.5-3.3 GA cherts from the Barberton Greenstone Belt, South Africa): applications for extraterrestrial life studies Electron microscope methods in the search for the earliest life forms on Earth (in 3.5-3.3 GA cherts from the Barberton Greenstone Belt, South Africa): applications for extraterrestrial life studies

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3441..158w&link_type=abstract

Proc. SPIE Vol. 3441, p. 158-169, Instruments, Methods, and Missions for Astrobiology, Richard B. Hoover; Ed.

Biology

1

Scientific paper

A suite of previously unknown microfossils and related biogenic structures has been revealed in some of the oldest sediments on Earth using scanning electron microscopy. High resolution scanning electron microscopy of HF-etched, biolaminated charts has brought to light a variety of small fossil coccoid and rod-shaped bacteria and associated fossil biofilms containing bedding planes. These microfossils have ben completely replaced by minerals. This vastly improved early Archaean microfossil database sheds new light on the diversity of life on Earth relatively soon after the cessation of heavy bolide bombardment at about 3.8 Ga. This is the critical period when life may have been able to develop on Mars and these early Archaean terrestrial microfossils will serve as valuable analogues for possible extraterrestrial life.

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