Section 2 Relative Dating: Which Came First?

•Write a news article from the perspective of a geologist •Include all of the key terms from this week •Your story must make sense •Be creative and have fun!

Relative Dating

• Determining the age and order of particular events or objects.

http://encyclopedia.laborlawtalk.com/wiki/images/thumb/1/14/250px-Grand_Canyon_geologic_column.jpeg

Superposition

• Younger rocks lie above older rocks in undisturbed sequences.

http://earth.geol.ksu.edu/liu/g100/figures/15_superposition.jpg

The Geologic Column

• An ideal sequence of rock layers that contain all the known fossils and rock formations on earth, arranged from oldest to youngest.

http://en.wikipedia.org/wiki/User:Maveric149/images/Idaho

http://www.nps.gov/care/resources/admin%20history/images/fig3.jpg

Disturbed Rock Layers

http://scamp.wr.usgs.gov/scamp/photo/aug88p07JKN-26M.jpg

http://www.stmarys.ca/conted/webcourses/GE O/GEO99/pubigneous/intrusion.gif

http://www.utdallas.edu/dept/sci_ed/torch/bb00_geo-al_files/image018.jpg

http://www.nps.gov/care/graphics/wtrpkt1.gif

The Missing Piece

• Unconformity-a surface missing part of geologic column.

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Nondeposition

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Erosion

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Disconformities

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Nonconformities

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Angular Unconformities