| The trail through Hagen Canyon (faintly visible at lower right) winds amidst massive sandstones of the Middle Miocene Ricardo Group (roughly 10 million years old) toward a hill in the distance strewn with blackish rubble from a volcanic basalt flow. |
| The trail through Hagen Canyon (faintly visible at lower right) winds amidst massive sandstones of the Middle Miocene Ricardo Group (roughly 10 million years old) toward a hill in the distance strewn with blackish rubble from a volcanic basalt flow. |