It's not a brilliant question you haven't said what scale you're looking at - Cosmic, Geologic, etc,
Geological time is divided as follows:
The Earth is over 4.5 billion years old, We live in the Holocene Epoch of the Quatenary Period of the Cenozoic Era of the Phanerozoic Eon
precambrian or cretaceos palezoic to mesozioc
Precambrian ERA
The Proterozoic Era was the longest.
Precambrian Era.
Paleozoic
Precambrian
The Precambrian. Hope this helps! :)
The period of Earth's time that would be considered longest is the Precambrian Era.
The Precambrian ... about 3 billion years.
Eon, Era, and Epoch: APEX :D
Precambrian
The Precambrian. Hope this helps! :)
Era
The Precambrian Era is the longest era with the least amount of scientific information available. This is because so few fossils have been discovered.
The earliest era of prehistory was also the longest. The Stone Age lasted from around 25,000 years to ago to about 5,500 years ago.
precambian
precambrian times
Precambrian Era.
The period of Earth's time that would be considered longest is the Precambrian Era.
The Precambrian ... about 3 billion years.
The Precambrian is actually the longest block (division) of time in earth geological history. But the Paleozoic era is the longest of the three "eras". The paleozoic era started about 550 million years ago and is marked by the appearance of abundant invertebrate life in the oceans. The paleozoic era ended about 225 million years ago with the forming of the supercontinent Pangaea.
C - PALEOZOIC ERA