A fully protected area (no biking inside) on the East side of the Oakland hills, sloping down between Sibley Volcanic Preserve and Redwood Regional Park.
At the foot of Mount Wanda and Mount Helen, a statue of John Muir stands surrounded by a young but already tall redwoods grove. Just a mile south from his …
Water, wind, and calcite erosion in per-volcanic sandstone formation.
Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause …
A fully protected area (no biking inside) on the East side of the Oakland hills, sloping down between Sibley Volcanic Preserve and Redwood Regional Park.