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An unconformity is a gap in the sedimentary rock record.

This animation shows the formation of an angular unconformity—one where the layers above and below the unconformity are not parallel to each other, but form an angle.

Several maps with plate motion arrows are shown under the heading of 'Teaching'.

Lawrence Lawver and Ian Dalziel of the University of Texas Institute for Geophysics (UTIG) are Principal Investigators of the PLATES Project.

Examine how the final result allows you to infer the sequence of the rocks' formation.

Using relative dating principles and the position of layers within rock, it is possible to reconstruct the sequence of geologic events that have occurred at a site.

What does the fossil record reveal concerning the present-day distribution of birds?

Visualizations cover the specific topics of earth history, relative age dating and life through geologic time.

Chrono Zoom is a free, open source interactive timeline tool for learning about all kinds of history, stretching back all 13.7 billion years to the Big Bang.

An animation depicting the formation of an unconformity in the rock record.

This animation shows an angular unconformity-one where the layers above and below the unconformity are not parallel to each other, but form an angle.

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