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Age and Movement of Rocks

Learn about relative dating, superposition, and disturbances in rock layers. Explore types of disturbed rock layers like folding, intrusions, and tilting, as well as unconformities. Discover how to determine the age of rocks using various methods.

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Age and Movement of Rocks

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  1. Age and Movementof Rocks

  2. a method of determining if an object is older or younger than another object. How old is old? • Relative Dating

  3. Layer upon Layers a principle that states younger rock layers lay on top older rock layers. • Superposition

  4. the arrangement of rock layers with the oldest at the bottom. Column of Ages geologic column

  5. Geologic Columns are not always horizontal. Forces from inside the Earth often disturb the layers. There are 4 types of disturbed rock layers. Disturbing Forces

  6. Disturbed Rock Layers A fault is a break in the Earth’s crust that moves rock layers in different directions.

  7. Disturbed Rock Layers Folding occurs when rock layers are bent and buckle.

  8. Disturbed Rock Layers Intrusions are when lava from inside Earth squeezes into cracks in rock layers and cool.

  9. Disturbed Rock Layers Tilting of rock layers occur when internal forces cause the rocks to slant one direction.

  10. Unconformities are breaks in the geologic column. 3 types: a. Disconformity (missing sedimentary rock layers) b. Nonconformity (sedimentary on Igneous) c. Angular

  11. http://www.wwnorton.com/college/geo/animations/geologic_history.htmhttp://www.wwnorton.com/college/geo/animations/geologic_history.htm • http://www.wwnorton.com/college/geo/animations/types_of_unconformity.htm

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