Geologic Time Notes
Relative Dating versus Absolute Dating
Relative dating is É
Absolute Dating is É
Catastrophism is the idea that changes to the Earth happen because of É
Gradualism is the idea that changes to the Earth happen É
Uiformitarianism is the idea that É
Nicolas Steno developed three laws
a. The principle of superposition
b. The principle of original horizontality 
c.  Principle of cross-cutting relationships
The principle of superposition is É
The principle of original horizontality is É
Principle of cross-cutting relationships is É
Practice with the tactile image of a rock cliff.

Inclusions are É
Unconformities are É
Disconformity is when É
Angular unconformity is when É
A nonconformity is É

The Grand Canyon has examples of unconformities

Fossils are made by É
There are five types of fossils.
A mold fossil is É
A replaced fossil is É
A cast fossil is É
A trace fossil is É
An original remains fossil is É
Practice identifying fossils with the sample fossils.

Index fossils are fossils which can be used as É
A geologic column is an ordering of fossils from youngest to oldest. Youngest fossils are (on top or on bottom). You can use a column to put rock layers in order.
Practice putting rock layers in order using a fossil.