Usage examples (18)

• In fact, BIFs from about 2.0 Ga, when the atmosphere was supposedly becoming more oxygenic, look the same as BIFs from earlier pre-Cambrian BIFs19.
• Wells is not at odds with modern geochemical thought or the scientific data to assert that primitive Earth volcanoes would have contributed to an oxygenic atmosphere.
• Some researchers have found that the uranium conglomerates bearing uraninite have a texture and mineralogical makeup (uraninite, pyrite, molybdenite, and sulfides) one would...
• They adapted to do oxygenic photosynthesis, to tap the energy in O