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Geologic Time Scale (GTS) Eons, Eras, Periods, Epochs
The scale is divided into eons, era, periods, and epochs. An . Eon, billions of years ago, is divided by the . Cambrian boundary. when the variety of life forms exploded. An . Era. includes mass extinctions that mark the boundaries between eras. A . Period. includes blocks of time when a unique rock series was laid down. Fossils
eons periods eras and epochs

[DOC File]Augusta County Public Schools
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The geologic time scale is divided into eons, eras, periods and epochs. Eons represent the longest intervals of geologic time. * Eons are divided into eras. * Each era is subdivided into periods. * Periods are divided into still smaller units called epochs. In general, the breaks between units on the time scale mark major geologic events or ...
timeline of eons and eras

[DOC File]Geologic Time - Mr. Ahearn's Earth Science - Home
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With geologic time, we use eons, eras, periods, and epochs. The largest unit of geologic time is an . eon. The four eons are the Hadean, Archean, Proterozoic, and the Phanerozoic. The first three eons are grouped together as . Precambrian Time. While the Precambrian spans . four. billion years, very …
epoch era eon

[DOC File]Use the geologic time scale to find the missing dates and ...
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The Earth has been around for the past 4.6 billion years. Just as human life is marked by the changes from infant, to child, to adolescent, to adult. The Earth’s years have been marked by geologic, environmental, and biological changes. Earth’s history is broken into large divisions called eons then eras, periods, and epochs.
the four eons

Royal Geographical Society
Now students should divide each of the eons into 2 or 3 eras based on a different criteria. For instance, the “Schoolian Eon” can be divided into the “Elementarian Era” and the “Middleschoolian Era”. Students should divide their tables by drawing a line across the era and period columns according to the criteria they chose and ...
epoch age period era eon

[DOC File]Name
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The Eons, Eras, Periods and Epochs are divided up by major changes in the types of organisms that inhabited the earth. For example, the end of the Mesozoic and beginning of the Cenozoic eras is marked by the extinction of dinosaurs and ammonoids. Look at the “Life on Earth” column on pg. 8 in the ESRTs.
difference between eon and era

[DOC File]Ch 12 - Mr. Neason's Earth Science - Home
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The three most important divisions on the geologic time scale are eons, eras, and periods. Unlike time lines you have used in history class, the divisions on the geologic time scale are of unequal length. For example, the Cambrian Period was 54 million years long, …
list of eons and eras

[DOC File]Geologic Time Scale:
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This involves slicing up Earth’s history into a hierarchy of time intervals. The longest of these are Eons, and these are separated into different Eras. Eras are subdivided into Periods, which in turn are subdivided into Epochs.
eon era period

[DOC File]Major Life Events - Mrs. Cline's Science Class!
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The names of most of the eons and eras end in . zoic, because these time intervals are often recognized on the basis of animal life. Rocks formed during the Proterozoic Eon may have fossils of relative simple organisms, such as bacteria, algae, and wormlike animals. Rocks formed during the Phanerozoic Eon may have fossils of complex animals and ...
eons periods eras and epochs

Eons and eras