This page features a geological time scale that divides Earth's history into eras, periods, and epochs, and coordinates these divisions with biological developments.
This virtual field trip shows students the geologic features of Enchanted Rock, a dome of Precambrian granite located in central Texas. They can see small faults, fault gouge, close-up photos showing the texture of the...
By examining GPS time series plots from stations on opposing sides of the San Andreas Fault, students will determine the relative movement between the two stations. They can then apply this to calculate the time it will...
Created by Edward P. Byerly and James F. Dewey of the U.S. Geological Survey, this is a textual reference that describes the history of seismographs, including how they work, as well as seismic waves, travel-time curves...
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