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Wednesday, November 9 th, 2011 Bell Ringer: Pull out your football field, and consider: Where does most of life fit into the geologic time scale? Humans?

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Presentation on theme: "Wednesday, November 9 th, 2011 Bell Ringer: Pull out your football field, and consider: Where does most of life fit into the geologic time scale? Humans?"— Presentation transcript:

1 Wednesday, November 9 th, 2011 Bell Ringer: Pull out your football field, and consider: Where does most of life fit into the geologic time scale? Humans? You? Todays Learning Goal: We are going to learn 5 Principles of Relative Age Dating Original Horizontality, Superposition, Cross-Cutting, Inclusions, Fossil Succession Todays Agenda: Football Field Conclusion Relative Age Dating Principles Begin Cross-Section Assignment

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3 Relative Age Dating John Day Fossil Beds, Painted Hills Unit

4 Principle of Original Horizontality Layers (Strata) of sediment are generally deposited in a horizontal position. If these layers are not horizontal, they have been deformed through earth processes.

5 Marys Peak, Corvallis, OR

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7 Principle of Superposition In an undeformed sequence of sedimentary rock, each strata is older than the one above and younger than the one below.

8 Marys Peak, Corvallis, OR

9 Principle of Fossil Succession Fossil organisms (Plants and Animals) show up in the geologic record in a definite and determinable order. Any period of geologic time can be recognized by its fossil content.

10 Oregon Coast, near Newport, OR He always does this. Hes such a NERD!

11 FOSSILS

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13 Principle of Inclusions A rock body containing inclusions of pre-existing rocks is younger than the rocks from which the inclusions came.

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16 Principle of Cross-Cutting Relationships When a fault or igneous intrusion cuts through other rocks, the fault and intrusion are younger than the rocks they affect.

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19 LETS PRACTICE THESE 5 PRINCIPLES!

20 Figure A

21 John Day Fossil Beds, Sheep Rock Unit

22 Figure B

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26 Figure 4

27 Design your own cross-section Start by writing out the geologic history, then drawing what it would look like! Requirements: – At least 5 layers – Intrusion – Fault OR Folding w/ erosion

28 Exit Card: No exit card today Todays Learning Goal: We are going to learn 5 Principles of Relative Age Dating Original Horizontality, Superposition, Cross-Cutting, Inclusions, Fossil Succession Tomorrows Learning Goals: Continuing our journey through the 5 Principles of Relative Age Dating


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