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Field
Field notebook
Save an observation draft without naming the rock. Location, GPS accuracy, and observable properties can be completed later.
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Learn
Geologic Summary
Time Machine
Earth Through Deep Time
Present day
Paleogeography by GPlates, EarthByte, and the University of Sydney.
Stratigraphic Column
Rock Units
Mineral Reference
Common minerals in the local reference library. Names link to petrography notes.
Advanced mode
Rock ID & Melt Lab
Study references only: photos are from Wikimedia Commons, Melt Lab is a simplified Bowen's Reaction Series visualization, and compositions are published averages rather than analyses of your sample.
Melt Lab
Illustrative Bowen's Reaction Series visualization only. It is not a calculated melt fraction or a measurement of your sample.
Average oxide composition
Elemental estimate for the selected rock
Estimated from average published oxide wt% values. Real samples vary.
Modal mineral estimator
Enter percentages for a rough suggestion.
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Explore Nearby Geology
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Geologic Passport
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