Eons periods eras and epochs
[DOC File]Ch 12 - Mr. Neason's Earth Science - Home
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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.
[DOC File]Augusta County Public Schools
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Earth's history is subdivided into eons, which are subdivided into eras, which are subdivided into periods, which are subdivided into epochs. The names of these subdivisions, like Paleozoic or Cenozoic, may look daunting, but to the geologist there are clues in some of the words.
[DOC File]Use the geologic time scale to find the missing dates and ...
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THE DIVISIONS FROM LARGE TO SMALL: EONS, ERAS, PERIODS, AND EPOCHS. THE DIVISIONS FROM SMALL TO LARGE: EPOCHS, PERIODS, ERAS, AND EPOCH. Major information found on the geologic time scale includes: Geologists divide the time between Precambrian and the present into three long units called .
[DOC File]Geologic Time
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(Pgs. 8 and 9 in the ESRTs) 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.
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
[DOC File]Geologic Time Scale:
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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 ...
[DOC File]The Geologic Time Scale (inside front cover of your book)
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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 few .
[DOC File]Geologic Time - Mr. Ahearn's Earth Science - Home
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Precambrian rocks were divided into two eons: Archean Eon: the beginning . Proterozoic Eon: earliest life . Younger rocks were grouped into the Phanerozoic Eon: visible life. Work in the 1900s. Radiometric dating allowed the various eons, eras, periods, and epochs to be dated. It turned out that the subdivisions are of very unequal duration.
[DOCX File]8-2 Benchmark Study Guide
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773 Each era is divided into smaller units called periods. 774 The changing fossil record also played an important part in establishing each of the periods. 775 Periods may be divided into epochs. Seven epochs are names for the periods of the Cenozoic era. 776 The epochs of other periods usually are just termed early, middle, and late.
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