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99,999 BCE
Earth is formed
The Earth is thought to have been formed 4.6 billion years ago by collisions of gas and dust. -
99,998 BCE
Oxygen begins to form in the atmosphere
Cynobacteria. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and oxygen. 2.7 billion years ago. -
99,997 BCE
First forms of Life are on Earth
Earth's initial life forms were bacteria, which could survive in the highly toxic atmosphere that existed during this time. This occurred 2.5 billion years ago. -
99,996 BCE
Pangea form
The giant ocean that surrounded the continent is known as Panthalassa. The movement of Earth's tectonic plates formed Pangaea and ultimately broke it apart. About 270 million years ago. -
99,995 BCE
Pangea begins to break
At this time most of the dry land on Earth was joined into one huge landmass that covered nearly a third of the planet's surface. The giant ocean that surrounded the continent is known as Panthalassa. The movement of Earth's tectonic plates formed Pangaea and ultimately broke it apart. Broke apart about 200 million years ago. -
99,994 BCE
1st multicellular organisms appear on earth
More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago. -
99,993 BCE
1st eukaryotes appear
Eukaryotes are organisms with a nucleus. The oldest evidence of eukaryotes is from 2.7 billion years ago. Scientists believe that a nucleus and other organelles inside a eukaryotic cell formed when one prokaryotic organism engulfed another, which then lived inside and contributed to the functioning of its host. -
99,992 BCE
Late Devonian extinction
416 million years ago -
99,991 BCE
Permian–Triassic extinction event
The Permian–Triassic extinction event, colloquially known as the Great Dying, the End-Permian Extinction or the Great Permian Extinction, occurred about 252 Ma ago. -
99,990 BCE
Triassic–Jurassic extinction event
The Triassic–Jurassic extinction event marks the boundary between the Triassic and Jurassic periods, 201.3 million years ago, and is one of the major extinction events of the Phanerozoic eon, profoundly affecting life on land and in the oceans -
99,988 BCE
Cretaceous–Paleogene extinction event
The astroid hit the earth and killed the dinasours -
99,980 BCE
1st Homo sapiens
About 5 to 7 million years ago, the first modern humans evolved. -
Holocene extinction
the ongoing extinction event of species during the present Holocene epoch, mainly as a result of human activity.
