The Clock of Eras is a graphic help to assist us visualize geologic time. The is almost impossible because that the human mind to comprehend the lot of time the it has actually taken because that the planet to develop to its current state, however we shot to imagine each stage of its unfolding and also the time that passed during each phase of development.

Just a note here: The original Clock of periods was developed about 100 years ago. Our understanding of geologic time has come a long way. To gain to the allude the just true eras on the clock now are the Paleozoic, Mesozoic, and also Cenozoic. The Hadean, Archean, and Proterozoic are currently termed Eons

The Clock of ages uses the analogy of a one clock to represent the advance of our earth in geologic time. One deserve to see at a glance the loved one time lengths that each major geologic era. So how does this Clock work? The Clock represents geologic time top top the Earth because its bear to the present, indigenous the initial events that brought around the formation up come now. Every hour represents about 383 million year on the very first clock and also 375 million year on the second.

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We can not take credit for the idea the this Clock. That is a principle that was arisen in Montessori Education. The colour as used in the Montessori clock relate to the ar of the life the was existing during the time. Therefore the Paleozoic Era is blue because life was mainly in the seas, the Mesozoic is brown since life relocated to the land, and the Cenozoic is green because of the fresh new life: the mammals.

The Clock of periods has been modified numerous times already and will proceed to change over time as scientists learn more and much more information with their research and discovery.

The an initial clock is our many up to date, and now includes the Phanerozoic Eon. The scale of this clock is slightly various from the second.

The lower clock is our previous version. It does not include the Phanerozoic Eon and some of the times listed for the Eons and also Eras are simply a bit out of date. The most significant change is the Hadean/Archean boundary. Scientists are finding brand-new evidence the life farther back in time. The result is a much shorter Hadean Eon and also a longer Archean.

Click on the links below the clock for a description of every time period.



The very first period the the clock of periods is the HadeanA summary of the Archean A summary of the Proterozoic EraA description of the Paleozoic EraA description of the Mesozoic EraA summary of the Cenozoic Era.

A clock of eras chart with Phanerozoic Eon. Click here for a printable version.

A blank or non-colored graph with Phanerozoic Eon. Click right here for a printable version

A clock of periods chart.Click below for a printable version.

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A blank or non-colored chart Click here for a printable version

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