An undeveloped roadside overlook along Oakville Road affords views of the vineyards in central Napa Valley. To th
e east, the Yountville Hills are the low hills beyond the vineyards. The highlands along the eastern side of Napa Valley are part of the southeastern Clear Lake-Sonoma volcanic field. It formed from lava and ash eruptions along the developing San Andreas Fault system in the late Tertiary (roughly between 8 to 2 million years ago). The region still is experiencing geothermal heating, possibly best represented by the hotsprings in the Calistoga area at the north end of Napa Valley.
e east, the Yountville Hills are the low hills beyond the vineyards. The highlands along the eastern side of Napa Valley are part of the southeastern Clear Lake-Sonoma volcanic field. It formed from lava and ash eruptions along the developing San Andreas Fault system in the late Tertiary (roughly between 8 to 2 million years ago). The region still is experiencing geothermal heating, possibly best represented by the hotsprings in the Calistoga area at the north end of Napa Valley.
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