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EARTH’S STORY AND THOSE WHO FIRST LISTENED
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The principle of uniformitarianism
Uniformitarionism is a principle that states that the same geologic processes shaping the earth.
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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.
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Uniformitarianism Wins!
Despite Hutton’s observations, catastrophism remained geology’s guiding principle for decades.
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Relative Dating
Which come first Relative dating – Determine whether an
object or an event is older or youngest than other object or events.
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The principle of superposition Superposition- is a principle that state
that younger rocks lie above older rocks in undisturbed sequences.
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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.
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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.
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