Eons I believe.
Hope that helped! =)
The longest in geological time is an Eon eg. Archeozoic Eon . Edit: there is also the supereon, which is usually composed of 2-3 eons.
The longest subdivision in geologic time is the eon, which is further divided into eras. Eons represent the largest interval of time in the geologic time scale, such as the Phanerozoic eon which encompasses the last 541 million years.
Eons are the longest subdivision of geologic time. They are typically divided into eras, which are further divided into periods, epochs, and ages. Eons represent the largest time divisions in the geologic time scale.
The order of units of geologic time from longest to shortest is: eon, era, period, epoch.
Joe Paterno
precambrian times
Precambrian Era.
About 50 to 100 million years.
In geologic time, the Hadean is the first EONof Earth's history, from it's formation 4.57 billion years ago to about 4 billion years ago. The Hadean is not an era, which is a smaller subdivision of geologic time.
The geologic time intervals from longest to shortest are eon, era, period, epoch, and age. This hierarchical sequence represents the largest divisions (eons) to the smallest subdivisions (ages) of Earth's history.
The longest segments of geologic time are eons, which are divided into eras, which are further divided into periods, epochs, and ages. The current eon, the Phanerozoic Eon, has been ongoing for approximately the last 542 million years.
Eras of geologic time are subdivided into periods, which are further subdivided into epochs. These divisions help geologists categorize and study Earth's history and the changes that have occurred over millions of years. Each subdivision represents a distinct period of time with unique geologic events and characteristics.