what happened a billion years ago ?

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https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life

https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life
Timeline of the evolutionary history of life – Wikipedia
The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet’s obligate anaerobes. Researchers have identified five other major extinction events in Earth’s history, with estimated losses below: [11] End Ordovician: 440 million years ago, 86% of all species lost, including graptolites

https://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life

https://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life
Timeline of the evolution of life on Earth | New Scientist
Timeline: The evolution of life The story of evolution spans over 3 billion years and shows how microscopic single-celled organisms transformed Earth and gave rise to complex organisms like…

https://en.wikipedia.org / wiki / History_of_Earth

https://en.wikipedia.org / wiki / History_of_Earth
History of Earth – Wikipedia
Eons. In geochronology, time is generally measured in mya (million years ago), each unit representing the period of approximately 1,000,000 years in the past. The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet.Each eon saw the most significant changes in Earth’s composition, climate and life. Each eon is subsequently divided into eras …

https://en.wikipedia.org/wiki/Timeline_of_the_far_future

https://en.wikipedia.org/wiki/Timeline_of_the_far_future
Timeline of the far future – Wikipedia
Artist’s concept of the Earth 5-7.5 billion years from now, when the Sun has become a red giant While the future cannot be predicted with certainty, present understanding in various scientific fields allows for the prediction of some far-future events, if only in the broadest outline.

https://news.harvard.edu/gazette/story/2021/04/harvard-scientists-determine-early-earth-may-have-been-a-water-world

https://news.harvard.edu/gazette/story/2021/04/harvard-scientists-determine-early-earth-may-have-been-a-water-world
Earth may have been a water world 3 billion years ago – Harvard Gazette
According to a new, Harvard-led study, geochemical calculations about the interior of the planet’s water storage capacity suggests Earth’s primordial ocean 3 to 4 billion years ago may have been one to two times larger than it is today, and possibly covered the planet’s entire surface.

https://www.livescience.com/46593-how-earth-formed-photo-timeline.html

https://www.livescience.com/46593-how-earth-formed-photo-timeline.html
Photo Timeline: How the Earth Formed | Live Science
After atmospheric oxygen levels spiked 2.4 billion years ago, not much happened on Earth for another billion years. Earth was so staid that scientists call this stretch of time the boring billion …

https://evolution.berkeley.edu/evolution-101/the-history-of-life-looking-at-the-patterns/how-we-know-what-happened-when

https://evolution.berkeley.edu/evolution-101/the-history-of-life-looking-at-the-patterns/how-we-know-what-happened-when
How we know what happened when – Understanding Evolution
Important events in the history of life Life began 3.8 billion years ago, and insects diversified 290 million years ago, but the human and chimpanzee lineages diverged only five million years ago. How have scientists figured out the dates of long past evolutionary events?

https://www.oxfordreference.com/display/10.1093/acref/9780191735332.timeline.0001

https://www.oxfordreference.com/display/10.1093/acref/9780191735332.timeline.0001
Evolution: c. 4 billion years ago – Oxford Reference
c. 4 billion years ago. The earth’s surface settles into a heaving turmoil of rock and water. Go to structure of the Earth in Visual English Dictionary (1 ed.) See this event in other timelines: First 10 billion years. Science. c. 3.5 billion years ago. Fossilized bacteria have been found in rock 3.5 billion years old in Africa.

https://www.nationalgeographic.com/science/article/precambrian-time

https://www.nationalgeographic.com/science/article/precambrian-time
Precambrian Time Information and Prehistoric Facts – National Geographic
Precambrian Time. Learn more about the period that occurred 4.5 billion to 542 million years ago. Precambrian time covers the vast bulk of the Earth’s history, starting with the planet’s creation …

https://www.britannica.com/science/geologic-time

https://www.britannica.com/science/geologic-time
Geologic time | Periods, Time Scale, & Facts | Britannica
5 nov. 2023Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago). lesoutrali bot