Rocks - Geology (U.S. National Park Service)

Access Wayside: Well-Traveled Boulder (U.S. National Park Service)

Petrified Forest National Park: Geologic Resources Inventory Report: Natural Resource Report NPS/NRPC/GRD/NRR?2010/218: KellerLynn, K., National Park Service: 9781492729204: : Books

Rock Types, rocks

Primary Rocks: Types, Characteristics, and Significance, rocks

3 Main Types of Rocks and Their Properties, rocks

NPS Geodiversity Atlas—Guadalupe Mountains National Park, Texas (U.S. National Park Service)

Geology (U.S. National Park Service)

2:30 pm: Geology Talk — South Rim Village (U.S. National Park Service)

Rock Types, rocks

Rock Types, rocks

Cyberpunk Samurai Bounty Hunter Sano by NWAwalrus on DeviantArt

Geologic Uplift - Colorado National Monument (U.S. National Park Service)

Rocks - Geology (U.S. National Park Service), rocks

Introduction to Rocks — Earth@Home, rocks

Glacial Erratics (U.S. National Park Service)