Relative dating of fossils worksheets
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The Geologic Time Periods Naming System In the early 1800’s a system for naming geologic time periods was devised using four periods of geologic time.
They were named using Latin root words, Primary, Secondary, Tertiary and Quaternary.
Fossils are the remains left behind by an organism.
Fossils are usually found within rocks of the Earth's crust.
In some locations the deposits are dominated by fish fossils and more rarely insects.
Each period name is a link to a web page with details about the geology, climate, plants and animals of that time.
Fossils are typically found in sedimentary rock, almost all of which were originally deposited as sediments by moving water.
As more information is collected, analyzed, and debated, the divisions created for looking at geologic time changes.
Below is a list of the currently accepted geologic periods.