The principle of uniformitarianism  Uniformitarionism is a principle that states that the same geologic processes shaping the earth.

Uniformitarianism Versus catastrophism … Catastrophism is a principle that states that all geologic change occurs suddenly Supporters of catastrophism claimed that the formation of all Earth’s features, such as it’s mountains, canyons, and seas, could be explained by rare, sudden events called catastrophes.

Uniformitarianism Wins!  Despite Hutton’s observations, catastrophism remained geology’s guiding principle for decades.

Relative Dating  Which come first  Relative dating – Determine whether an object or an event is older or youngest than other object or events.

The principle of superposition  Superposition- is a principle that state that younger rocks lie above older rocks in undisturbed sequences.

The geologic column  Geologic column- is an ideal sequence of rocks layers that contains all the known fossils and rocks formations on earth arranged from oldest to youngest.

Types of unconformities  Disconformities- parallel rocks layer is missing.  Nonconformity- exists where sedimentary is.  Angular unconformity- Exist between horizontal rock layer and rock layer are titled or foled.