Tag Archives: Geobiology

This image is a high-resolution microscopic view of filamentary strands of cyanobacteria, observed through a green filter.
c. 2.5 Billion BCE: The Great Oxidation – A Transformative Event in Earth’s History

Explores the Great Oxidation, a pivotal event caused by the rise of oxygen-producing cyanobacteria, which significantly altered Earth's atmosphere and led to the extinction of many anaerobic species while paving the way for aerobic life [...]

This image shows a shallow-water kelp forest off the coast of Southern California, where plants utilize oxygenic photosynthesis to transform sunlight into internal energy, like glucose.
c. 3.4 Billion BCE: The Evolution of Photosynthesis – Transforming Earth

Discusses the evolution of photosynthesis, highlighting its impact on Earth's atmosphere and life forms. It traces the development from early anoxygenic photosynthesis to the oxygen-producing photosynthesis by cyanobacteria, leading to the Great Oxidation event.

This image shows contemporary stromatolite domes in the shallow waters of Shark Bay, Western Australia. The inset provides a cross-sectional view of a 2.4-inch-tall (6 cm) fossilized stromatolite from the Old Range of Western Australia.
c. 3.7 Billion BCE: Stromatolites – Windows into Earth’s Early Life

Delves into stromatolites, the oldest known fossil evidence of life on Earth, explaining their formation by microbial groups, particularly cyanobacteria, and their role in the Earth's atmospheric evolution.