As geochemical appraisals of mineral regions of commercial prospectivity evolve, the
organic matter associated with metal rich ores has attracted greater attention. Petroleum …

Just as geological samples from Earth record the natural history of our planet, astromaterials
hold the natural history of our solar system and beyond. Astromaterials acquisition and …

Hopanes and steranes found in Archean rocks have been presented as key evidence
supporting the early rise of oxygenic photosynthesis and eukaryotes, but the syngeneity of …

The evolution of oxygenic photosynthesis had a profound impact on the Earth's surface
chemistry, leading to a sharp rise in atmospheric oxygen between 2.45 and 2.32 billion …

The atmosphere has apparently been oxygenated since the 'Great Oxidation Event'ca 2.4
Ga ago, but when the photosynthetic oxygen production began is debatable. However …

Abstract The Mesoproterozoic Hongshuizhuang Formation (∼ 1.4 Ga) from northern China
consists of organic-rich sediments which record important environmental and biological …

Cores recovered during the Agouron Griqualand Drilling Project contain over 2500m of well-
preserved late Archean Transvaal Supergroup sediments, dating from ca. 2.67 to 2.46 Ga …

Biomarker molecules are valuable for the elucidation of ancient microbial ecosystems and
the characterization of petroleum source rocks. For such studies, acquisition of reliable …

Archean shales from the Pilbara in Western Australia contain biomarkers that have been
interpreted as evidence for the existence of cyanobacteria and eukaryotes 2.7 billion years …

The power of molecular oxygen to drive many crucial biogeochemical processes, from
cellular respiration to rock weathering, makes reconstructing the history of its production and …