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Activities from the 2005 GSA Poster Session on Rates and Time



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Determining Earthquake Recurrence Intervals from Trench Logs part of Rates and Time:GSA Activity Posters
Trench logs of the San Andreas Fault at Pallett Creek, CA are the data base for a lab or homework assignment that teaches about relative dating, radiometric dating, fault recurrence intervals and the reasons for uncertainty in predicting geologic phenomena. Students are given a trench log that includes several fault strands and dated stratigraphic horizons. They estimate the times of faulting based on bracketing ages of faulted and unfaulted strata. They compile a table with the faulting events from the trench log and additional events recognized in nearby trenches, then calculate maximum, minimum and average earthquake recurrence intervals for the San Andreas Fault in this area. They conclude by making their own prediction for the timing of the next earthquake.

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Using Dendrochronology to Determine the Age and Past Environments of the Black Forest Region, Colorado, USA part of Rates and Time:GSA Activity Posters
The use of dendrochronology in determining the geologic history of a location. The development of an understanding how tree growth can indicate the relationships between climate, geomorphology, ecology and archeology.