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The geologic time scale is divided into periods, which are then divided into epochs, which are further divided into ages. For example, the time of the dinosaurs lasted 3 periods (Triassic, Jurassic, Cretaceous), each period had 3 epochs (late, early, middle), and each age fit into one of those. Many epochs have more than 1 age associated with them.
As for the basis for differentiating the eras, I'm not so sure. The only one I can say for sure is the end of the Cretaceous, which is when the dinosaurs suddenly became extinct due to a meteor impact. I think the divisions are based on significant, global-scale events that changed the world.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agofrom oldest to youngest the systems are
Precambrien
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Triassic
Jurassic
Cretaceous
Palaeogene
Neogene
Quaternary
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What are the major time intervals represented by the geologic time scale?
The Geologic Time Scale is divided up by four major intervals. In order from Largest to smallest: Eons are the largest time frame covering hundreds of millions of years. Eons are divided into smaller time intervals known as Eras. Eras are subdivided into Periods. Periods are broken into finer subdivisions known as Epochs.
What does the geologic time scale tell about the life on Earth?
The geologic time scale shows the timing and relationship of events that have occurred throughout Earth's history.
Which scale shows geologic and biological history of earth?
Geological Time Scale.
What division in the geologic time scale is the shortest?
epoch
What does the geologic time scale?
It measures the age of a fossil.:)
What does geologic time have to do with eras?
Eras are subdivisions of larger units of geologic time called eons.
How are the subdivisions of geologic time relate to one another?
they all connect
What is the basis on which the subdivisions of the geological time scale are made for?
what is the basis on which subdivisions are made
What do the relative geologic time and absolute geologic time combine to form?
The geologic time scale.
What do you called the scale of time that records the events about the history of the earth?
Geologic Time. It's called the Geologic Time Scale.
What are the major time intervals represented by geologic time scale?
The Geologic Time Scale is divided up by four major intervals. In order from Largest to smallest: Eons are the largest time frame covering hundreds of millions of years. Eons are divided into smaller time intervals known as Eras. Eras are subdivided into Periods. Periods are broken into finer subdivisions known as Epochs.
What are the major time intervals represented by the geologic time scale?
The Geologic Time Scale is divided up by four major intervals. In order from Largest to smallest: Eons are the largest time frame covering hundreds of millions of years. Eons are divided into smaller time intervals known as Eras. Eras are subdivided into Periods. Periods are broken into finer subdivisions known as Epochs.
What word represents the broadest division on a geologic time scale?
Precambrian is the largest division of the geologic time scale.
In which eon of the geologic time scale means visable life?
Phanerozoic is the eon which geologic time scale means visable life.
Which is the largest of time on the geologic time scale?
The Precambrian
How do humans relate to geologic time scale?
in the scope of geologic time, how significant is the presence of humans?
What geologic time scale are humans in?
Cenozoic
