Rock.d is an App which was created by two American Geoscientists: Shanan Peters, a professor of geoscience at the University of Wisconsin–Madison and Patrick McLaughlin, formerly at the Wisconsin Geological and Natural History Survey. They use the Macrostat database.
The App is basically a GPS-Powered Field Guide in your pocket. You can record your observations – photograph it, measure it, classify it and describe it.
Below is an example from Studley Park. If you’re ever wondering ‘what rock am I standing on?’ then this is the place to go. It also shows other people’s check-ins, so you can connect with other rock-lickers.
The App is available at the Apple App Store as well as Google Play Store.
Any field guide with the Rock.d logo will have be available as checkins in the Rock.d App.