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Natural oil seep along Tarwater Creek, San Mateo County, California

By Pacific Coastal and Marine Science Center
Oil with a taffy-like consistency in a natural seep along a small creek, being poked with a stick to show its gooey nature.
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Detailed Description

The natural oil seep in this photo is located in Pescadero Creek County Park, where the Canyon Trail crosses Tarwater Creek. The oil is black, has a taffy-like consistency, and smells like motor oil.

Sources/Usage

Public Domain.