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Determining Relative Age Page 185

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Presentation on theme: "Determining Relative Age Page 185"— Presentation transcript:

1 Determining Relative Age Page 185
The Rock Record Determining Relative Age Page 185

2 Uniformitarianism The present is the key to the past
James Hutton, the Father of Geology What we see now is what has happened in the past Idea popularized by Sir Charles Lyell The Principles of Geology

3 Catastrophism Earth has been shaped by major catastrophes in a short amount of time

4 Art work inspired by the idea
The Future of Catastrophism

5 Archbishop James Usher
1664 in Ireland Said Earth began 4004BC Based on Genesis Added up genealogies October 23, 4004 BC

6 Attention! Achtung! For your semester final, you may use returned papers and notes, but not your book You may only use them if they are in a notebook, NOT loose from your book!

7 Relative Dating In 1669, Nicholas Steno outlined basic principles for determining relative ages in rocks P

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9 1. Principle of Original Horizontality
Sed layers were originally deposited horizontally So, sed layers that are not horizontal have been deformed

10 Principle of Lateral Continuity
Sed layers extend laterally to the edge of their basin or thin to nothing

11 3. Principle of Superposition
The oldest layers are on the bottom Younger Older

12 Principle of Inclusion
Included stuff is older than the intrusion

13 5. Principle of Cross-cutting Relationships
Any feature that cuts across a rock or sediment must be younger than the rock or sediment it cuts

14 Review the Principles one piece of bread was there for me to spread the PB (or J) on (principle of superposition); the bread had to be (relatively) flat for me to spread the peanut butter on it (principle of original horizontality);

15 the peanut butter probably covered the entire piece of bread (principle of LATERAL continuity);
if I slice the sandwich, all those layers (PB, J and bread) had to be there for me to cut through them (principle of cross cutting relationships;

16 if there is jelly in my peanut butter, I put the jelly on first - and vice versa (principle of inclusions).

17 Assignment Work from the bottom up using the principles you just read about

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