https://www.kqed.org/quest/23196/geological-outings-around-the-bay-the-moraga-formation
Geological Outings Around the Bay: The Moraga Formation | KQED
The Moraga Formation's distinctive set of volcanic rocks can be visited in many places in the East Bay hills. Let's have a look at five localities.
around the baymoraga formationgeologicaloutingskqed