Description

Principle stating that geologic processes that shape Earth act at a continuous rate over
Principle stating that all geologic change occurs suddenly
Philosopher and scientist considered the father of Geology
Principle stating that younger rocks lie above older rocks in undisturbed sequences
Process of determining whether an object or event is older or younger than other objects or events
Disruption of rock sequences that can tilt or fold rock layers, putting older rock above younger rock.
An ideal sequence of rock layers containing all the known fossils and rock formations on Earth arranged from oldest to youngest.
This example of disturbed rock occurs when rock layers bend and buckle from Earth's internal forces
A break in the Earth's crust along which blocks of the crust slide relative to one another
A surface that represents a missing part of the geologic column
Process of establishing the age (in years) of an object, such as a rock layer or fossil
Atoms of the same element that have the same number or protons but different numbers of neutrons
process by which unstable, radioactive isotopes break down into stable isotopes of other elements
Using the ratio of parent material to daughter material to determine absolute age
The time it takes for one-half of a radioactive sample to decay
Type of Radiometric Dating used to date rocks more than 10 million years old
Isotope used to date rocks older than 100,000 years

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Geologic Dating

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Earth's History

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Earth's History

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Fossil

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rocks and minerals

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Frequently Asked Questions

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