Ancient Lava Flows at Petroglyph National Monument
![Image: Ancient Lava Flows at Petroglyph National Monument](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/Management_ParksProtectedAreas_NationalMonuments_00013.jpg?itok=EeH9V7ir)
Detailed Description
Visitor trail in Boca Negra Canyon of the Petroglyph National Monument. A visitor center structure is located on the left. The ridge is a remnant of an old lava flow.
Sources/Usage
Public Domain.