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Mod. D Unit 1 Less 1

Mod D Unit 1 Lesson 1 The Fossil Record

TermDefinition
Fossil the remains or traces of once-living organisms.
Sedimentary Rock types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.
Law of Superposition states that in a sequence of undisturbed sedimentary rocks, the oldest layers are at the bottom and the youngest ones are at the top.
Geologic Columns an ordered arrangement of rock layers that is based on the relative ages of the rocks, with the oldest rocks at the bottom of the column.
Index Fossil a widely distributed fossil, of narrow range in time, regarded as characteristic of a given geological formation, used especially in determining the age of related formations.
Radiometric Dating the method of finding the absolute age of rock based on comparing the amounts of unstable, radioactive particles to stable particles in a sample.
Geologic Timescale divides Earth’s history into intervals of time defined by major events or changes on Earth.
Fossil Record the collection of all known fossils and their placement in order from earliest to most recent.
Extinction when all members of a species die out.
Created by: howellr