Abstract The Archean era (4 to 2.5 billion years ago, Ga) yielded rocks that include the
oldest conclusive traces of life as well as many controversial occurrences. Carbonaceous …

This chapter is devoted to the carbon and nitrogen stable isotope compositions of terrestrial
diamonds with a strong focus on monocrystalline diamonds formed in Earth's mantle. The …

Abstract The 3,430-million-year-old Strelley Pool Chert (SPC)(Pilbara Craton, Australia) is a
sedimentary rock formation containing laminated structures of probable biological origin …

Astrobiology is the science that seeks to understand the story of life in our universe.
Astrobiology includes investigation of the conditions that are necessary for life to emerge …

Life requires a wide variety of bioessential trace elements to act as structural components
and reactive centers in metalloenzymes. These requirements differ between organisms and …

Archaean greenstone belts and associated granitic rocks comprise some of the most diverse
rock types on the Earth's surface and were formed during the early stages of the …

Here we review published studies on the abundance and diversity of terrestrial rock-hosted
life, the environments it inhabits, the evolution of its metabolisms, and its fossil biomarkers to …

Hydrogen-lean kerogen (atomic H/C< 0.46) isolated from the 3.4 Ga Strelley Pool Chert in
the North Pole area, Pilbara Craton, Western Australia, were studied by vibrational …

Alteration textures in volcanic glass from the seafloor fall into two classes, one suggestive of
abiotic/diffusive hydration and chemical exchange, and another likely to be caused by …

Micron-sized cavities created by the actions of rock-etching microorganisms known as
euendoliths are explored as a biosignature for life on early Earth and perhaps Mars. Rock …