The app is a database and mapping application for the Devonian Lithological Database, developed by Thomas L. Moore as part of his dissertation at the University of Arizona (1999). These data are freely available for non-commercial users. FEATURES 1. Database of Devonian rocks containing over 5000 records. 2. Ability to narrow selection by age. 3. Interactive global map for displaying selection. 4. The ability to view specific records containing all of the information from the original database.