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[DOC File]National Park Service
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The geological time scale subdivides the four eras of Earth's history into periods which are subdivided into epochs. The first and largest segment of geologic time is called the Pre-Cambrian. There was very little life until the beginning of the second era, the Paleozoic, during which most organisms lived in …
eras of earth's history

[DOC File]Mrs. G -- Rm 215 | Oceanography & Earth Science
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By studying rocks and fossils at many different sites, geologists have established a geologic record of the history of life on Earth, which is divided into four eons. The first three eons—the Hadean, Archaean, and the Proterozoic—together lasted approximately 4 billion years.
eras of life on earth

Divisions of the Geologic Time Scale: A Lesson Plan
The earth can be divided into four main geologic eras. An era is a span of time in the earth’s history where significant geologic events occurred.
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[DOC File]STUDY GUIDE: Classification and the Five Kingdom System
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Geologic Time is divided into four Eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic. Click on one of the images for a peek at life at the sea (Tour 2). A. 470 Million Years Ago - Middle __________________ Period in the
four types of era

[DOC File]History of Life Webquest
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Horizontal strata exposed in the canyon retrace geological history over 2 billion years and represent the four major geologic eras. Criteria (i) Within park boundaries, the geologic record spans all four eras of the earth's evolutionary history, from the Precambrian to the Cenozoic.
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[DOC File]Earth & Space Science Concepts Study Sheet
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The geologic time scale divides the history of life on Earth into four eras, delineated by major changes recorded in the fossil record. List these four eras and briefly describe some factors that may have contributed to the transitions between eras. (HINT: Consider continental drift, mass extinctions, and adaptive radiations.)
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[DOC File]Carlsbad Caverns National Park
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6. Lightly shade each of the four major Eras a different color. 7. Label each of the four Eras. Event Years ago Placement Earth’s beginning???? 4.6 billion 60 cm past 4 billion. Oldest microfossils 3.5 billion 50 cm past 3 billion. Oxygen created 2.5 billion 50 cm past 2 billion
eras of the earth timeline

[DOC File]Unit 1: The Changing Earth
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All four major eras of Earth's history are represented, from the Precambrian to the Cenozoic. Most notable is an unparalleled sequence of undisturbed Paleozoic strata spanning five geologic periods. Paleontological remains document the evolution of life forms from single-celled organisms in the Precambrian Era; through the development of plants ...
the four eras of history

[DOC File]Geologic Eras - Miss Hamilton
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Geological time of earth is separated into three units: ERAS: Large units of time determined by major global environmental or geological changes. There are four eras – Precambrian, Paleozoic, Mesozoic & Cenozoic. PERIODS: are units of time within each era symbolized by regional changes.
eras of earth's history

The four eras of earth