Easy day hike with County Hiker friends, at two East Bay Regional Parks near Oakland, CA. We are in search of labyrinths!
It's hard to think of these rolling hills as volcanic -- However, when you see the rocks underlying the vegetation, you can see that they are basalt and other related material.
It's hard to think of these rolling hills as volcanic -- However, when you see the rocks underlying the vegetation, you can see that they are basalt and other related material.
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