Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Dating Unconformity


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Comment: 21:02 - 21:25 (00:23)

Source: Annenberg/CPB Resources - Earth Revealed - 8. Earth's Structures

Keywords: "Dee Trent", unconformity, fossil, "radiometric age dating"

Our transcription: By identifying fossils or through radiometric age dating, geologists can find out approximately when an exposed unconformity developed.

Because unconformities are created by important changes in the geologic environment, knowing when they formed helps geologists construct a chronology of past events in Earth's history.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/07.01.23.html Page Contact: InfoBank staff Page Last Modified: Fri Sep 18 02:38:52 PDT 2009 (wcs)