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Principle of Superposition and Unconformities

Mountains BrainPOP has good examples of unconformities. Principle of Superposition and Unconformities. The Tales Rocks Tell and the Changes to the Story. Nicholas Steno (1638-1686). Danish Catholic Bishop and Scientist Started in anatomy but fossils expanded his work into geology

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Principle of Superposition and Unconformities

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  1. Mountains BrainPOP has good examples of unconformities Principle of Superposition and Unconformities The Tales Rocks Tell and the Changes to the Story

  2. Nicholas Steno (1638-1686) • Danish Catholic Bishop and Scientist • Started in anatomy but fossils expanded his work into geology • Introduced the concept of the Principle of Superposition, Unconformities and fossils being part of once living organisms.

  3. James Hutton (1726-1797) • Scottish Farmer • Started in medicine but chemistry expanded his work into geology • Introduced the concept of the Rock Cycle (before Hutton it was thought that rocks precipitated out of water) • Introduced the concept of Deep Time (Earth is millions of years old) • Before Hutton the Earth was thought to be about six thousand years old (Oct. 22, 4004 BC)

  4. Principle of Superposition: • In rock layers (strata) the oldest rocks are on the bottom and the newest rock is on the top. • This allows you to find the relative age (older/newer) of the rocks based on their position. • Analogies: • The dirty clothes pile • Magazines

  5. Under Armour’s “new line”:

  6. Unconformities: • Unconformities are changes that occur in the rock layers (strata). • Unconformities can be caused by plate tectonics (earthquakes), volcanic activity (magma pushing and lava flows), erosion (water and glaciers), lack of deposition (no new sediment is deposited over a long period), etc.

  7. What happened? A B This is NOT a man made layer. C D E F

  8. Turn to page 196 in your ScienceSaurus.

  9. Angular Unconformity (A re-write)

  10. Disconformities (missing chapters)

  11. The Grand Canyon (AZ)

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