What kind of rocks exist under your house? Examine a geologic map showing the distribution of geologic materials that are visible at the Earth’s surface in the Bay Area. Geologist produce maps like this to understand both past and present-day processes affecting a region on Earth.

Google Earth File

This layer classifies the geologic materials of the Bay Area by age, dividing them into eons, eras, periods, and epochs of geologic time. Click on a geologic unit to determine its age and rock type.

Geology(6 kB)

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Google Earth software enables you to zoom in beyond the level of accuracy provided in these data layers.

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