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Precambrian Era
The Precambrian Era encompasses all of geological time prior to the Cambrian Period, covering approximately 88% of Earth's history and marked by the formation of the Earth and the appearance of early life.
Oldest Rocks
The earliest-formed rocks on Earth or within a specific geological setting, often found in the deepest layers of the Earth's crust.
Mass Extinctions
Significant global events in the Earth's history where large percentages of species die out in a relatively short period of time, often due to catastrophic environmental changes.
Geologic Timescale
A method of dating based on the chronological correlation of Earth's geological layers to time, utilized by geologists for depicting the sequence and association of historical events on Earth.
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