great oxygenation event
Word Rarity
Very rare
Frequency: Zipf frequency 2.48 in modern English
36
Scrabble Score
21
Letters
3
Syllables
11
Unique Chars
Meaning
name
A period around 2.5 to 2.3 billion years ago when the atmosphere of the Earth and its shallow oceans saw a sustained increase in oxygen, caused by the widespread proliferation of photosynthetic cyanobacteria.
Inflected Forms
the Great Oxygenation Event (canonical)