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Coastal and Marine Geology Program > Geology of the Gulf of the Farallones National Marine Sanctuary

Geology of the Gulf of the Farallones National Marine Sanctuary

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Digitally-enhanced images used to distinguish sonic returns. Top - A double blip characterizes the return from a 55-gallon oil drum. Bottom - Tightly-gathered multiple returns are characteristic of a cluster of barrels that were originally strapped together before being dumped overboard.
Digitally-enhanced images used to distinguish sonic returns.

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Coastal and Marine Geology Program > Geology of the Gulf of the Farallones National Marine Sanctuary
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