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Unit 2 Chapter 3

Fossils and Relative Age

DefinitionTerm
A scientist who studies fossils. Paleontologist
Remains, imprints, or traces of prehistoric organisms. Fossil
Fossils in which the spaces inside are filled with minerals from groundwater. Permineralized Remains
Thin film of carbon residue preserved as a fossil. Carbon Film
A type of body fossil that forms in rock when an organism with hard parts is buried, decays, or disolves, and leaves a cavity in the rock. Mold
A type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock. Cast
Remains of species that existed on Earth for a relatively short period of time, were abundant and widespread geographically, and can be used by geologists to assign the ages of rock layers. Index Fossil
States that in undisturbed rock layers, the oldest rocks are on the bottom and the rocks become progressively younger toward the top. Principle of Superposition
The age of something compared with other things. Relative Age
Gap in the rock layer that is due to erosion or periods without any deposition. Unconformity
Age, in years, of a rock or other object. Absolute Age
The preservation of an organisms soft parts for thousands or millions of years in amber, tar, or ice. Original Remains
Fossilized tracks or other evidence of the activity of organisms. Trace Fossils
Created by: rwaters